diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 542e04b1d03..863bc7a20b8 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -20,6 +20,9 @@ Drupal 7.0, xxxx-xx-xx (development version)
       simple method for blocking IP addresses. E-mail and username restrictions
       are now available in a contributed module. IP address range blocking is
       no longer supported and should be done at the server level.
+- Removed throttle module:
+    * The throttle module has been removed. Alternative methods to improve
+      performance are available in core and contributed modules.
 
 Drupal 6.0, 2008-02-13
 ----------------------
diff --git a/includes/install.inc b/includes/install.inc
index 2d74a9230ed..9398077a10a 100644
--- a/includes/install.inc
+++ b/includes/install.inc
@@ -359,7 +359,7 @@ function drupal_install_system() {
   module_invoke('system', 'install');
   $system_versions = drupal_get_schema_versions('system');
   $system_version = $system_versions ? max($system_versions) : SCHEMA_INSTALLED;
-  db_query("INSERT INTO {system} (filename, name, type, owner, status, throttle, bootstrap, schema_version) VALUES('%s', '%s', '%s', '%s', %d, %d, %d, %d)", $system_path . '/system.module', 'system', 'module', '', 1, 0, 0, $system_version);
+  db_query("INSERT INTO {system} (filename, name, type, owner, status, bootstrap, schema_version) VALUES('%s', '%s', '%s', '%s', %d, %d, %d)", $system_path . '/system.module', 'system', 'module', '', 1, 0, $system_version);
   // Now that we've installed things properly, bootstrap the full Drupal environment
   drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
   module_rebuild_cache();
diff --git a/includes/module.inc b/includes/module.inc
index c87393c7b22..d0f10029845 100644
--- a/includes/module.inc
+++ b/includes/module.inc
@@ -58,21 +58,15 @@ function module_list($refresh = FALSE, $bootstrap = TRUE, $sort = FALSE, $fixed_
     }
     else {
       if ($bootstrap) {
-        $result = db_query("SELECT name, filename, throttle FROM {system} WHERE type = 'module' AND status = 1 AND bootstrap = 1 ORDER BY weight ASC, filename ASC");
+        $result = db_query("SELECT name, filename FROM {system} WHERE type = 'module' AND status = 1 AND bootstrap = 1 ORDER BY weight ASC, filename ASC");
       }
       else {
-        $result = db_query("SELECT name, filename, throttle FROM {system} WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC");
+        $result = db_query("SELECT name, filename FROM {system} WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC");
       }
       while ($module = db_fetch_object($result)) {
         if (file_exists($module->filename)) {
-          // Determine the current throttle status and see if the module should be
-          // loaded based on server load. We have to directly access the throttle
-          // variables, since throttle.module may not be loaded yet.
-          $throttle = ($module->throttle && variable_get('throttle_level', 0) > 0);
-          if (!$throttle) {
-            drupal_get_filename('module', $module->name, $module->filename);
-            $list[$module->name] = $module->name;
-          }
+          drupal_get_filename('module', $module->name, $module->filename);
+          $list[$module->name] = $module->name;
         }
       }
     }
@@ -143,8 +137,7 @@ function module_rebuild_cache() {
     else {
       // This is a new module.
       $files[$filename]->status = 0;
-      $files[$filename]->throttle = 0;
-      db_query("INSERT INTO {system} (name, info, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $file->name, serialize($files[$filename]->info), 'module', $file->filename, 0, 0, $bootstrap);
+      db_query("INSERT INTO {system} (name, info, type, filename, status, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d)", $file->name, serialize($files[$filename]->info), 'module', $file->filename, 0, $bootstrap);
     }
   }
   $files = _module_build_dependencies($files);
@@ -289,7 +282,7 @@ function module_enable($module_list) {
     $existing = db_fetch_object(db_query("SELECT status FROM {system} WHERE type = '%s' AND name = '%s'", 'module', $module));
     if ($existing->status == 0) {
       module_load_install($module);
-      db_query("UPDATE {system} SET status = %d, throttle = %d WHERE type = '%s' AND name = '%s'", 1, 0, 'module', $module);
+      db_query("UPDATE {system} SET status = %d WHERE type = '%s' AND name = '%s'", 1, 'module', $module);
       drupal_load('module', $module);
       $invoke_modules[] = $module;
     }
@@ -331,7 +324,7 @@ function module_disable($module_list) {
 
       module_load_install($module);
       module_invoke($module, 'disable');
-      db_query("UPDATE {system} SET status = %d, throttle = %d WHERE type = '%s' AND name = '%s'", 0, 0, 'module', $module);
+      db_query("UPDATE {system} SET status = %d WHERE type = '%s' AND name = '%s'", 0, 'module', $module);
       $invoke_modules[] = $module;
     }
   }
diff --git a/includes/session.inc b/includes/session.inc
index 25d2479d4ab..b3ef15c3c80 100644
--- a/includes/session.inc
+++ b/includes/session.inc
@@ -68,7 +68,7 @@ function sess_write($key, $value) {
     // Only save session data when when the browser sends a cookie. This keeps
     // crawlers out of session table. This reduces memory and server load,
     // and gives more useful statistics. We can't eliminate anonymous session
-    // table rows without breaking throttle module and "Who's Online" block.
+    // table rows without breaking "Who's Online" block.
     if ($user->uid || $value || count($_COOKIE)) {
       db_query("INSERT INTO {sessions} (sid, uid, cache, hostname, session, timestamp) VALUES ('%s', %d, %d, '%s', '%s', %d)", $key, $user->uid, isset($user->cache) ? $user->cache : '', ip_address(), $value, time());
     }
diff --git a/modules/block/block-admin-display-form.tpl.php b/modules/block/block-admin-display-form.tpl.php
index 369d0934630..5e45ca3f342 100644
--- a/modules/block/block-admin-display-form.tpl.php
+++ b/modules/block/block-admin-display-form.tpl.php
@@ -9,7 +9,6 @@
  * - $block_regions: An array of regions. Keyed by name with the title as value.
  * - $block_listing: An array of blocks keyed by region and then delta.
  * - $form_submit: Form submit button.
- * - $throttle: TRUE or FALSE depending on throttle module being enabled.
  *
  * Each $block_listing[$region] contains an array of blocks for that region.
  *
@@ -18,7 +17,6 @@
  * - $data->block_title: Block title.
  * - $data->region_select: Drop-down menu for assigning a region.
  * - $data->weight_select: Drop-down menu for setting weights.
- * - $data->throttle_check: Checkbox to enable throttling.
  * - $data->configure_link: Block configuration link.
  * - $data->delete_link: For deleting user added blocks.
  *
@@ -41,9 +39,6 @@
       <th><?php print t('Block'); ?></th>
       <th><?php print t('Region'); ?></th>
       <th><?php print t('Weight'); ?></th>
-      <?php if ($throttle): ?>
-        <th><?php print t('Throttle'); ?></th>
-      <?php endif; ?>
       <th colspan="2"><?php print t('Operations'); ?></th>
     </tr>
   </thead>
@@ -51,19 +46,16 @@
     <?php $row = 0; ?>
     <?php foreach ($block_regions as $region => $title): ?>
       <tr class="region region-<?php print $region?>">
-        <td colspan="<?php print $throttle ? '6' : '5'; ?>" class="region"><?php print $title; ?></td>
+        <td colspan="5" class="region"><?php print $title; ?></td>
       </tr>
       <tr class="region-message region-<?php print $region?>-message <?php print empty($block_listing[$region]) ? 'region-empty' : 'region-populated'; ?>">
-        <td colspan="<?php print $throttle ? '6' : '5'; ?>"><em><?php print t('No blocks in this region'); ?></em></td>
+        <td colspan="5"><em><?php print t('No blocks in this region'); ?></em></td>
       </tr>
       <?php foreach ($block_listing[$region] as $delta => $data): ?>
       <tr class="draggable <?php print $row % 2 == 0 ? 'odd' : 'even'; ?><?php print $data->row_class ? ' ' . $data->row_class : ''; ?>">
         <td class="block"><?php print $data->block_title; ?></td>
         <td><?php print $data->region_select; ?></td>
         <td><?php print $data->weight_select; ?></td>
-        <?php if ($throttle): ?>
-          <td><?php print $data->throttle_check; ?></td>
-        <?php endif; ?>
         <td><?php print $data->configure_link; ?></td>
         <td><?php print $data->delete_link; ?></td>
       </tr>
diff --git a/modules/block/block.admin.inc b/modules/block/block.admin.inc
index ab125d79288..2c53c998c90 100644
--- a/modules/block/block.admin.inc
+++ b/modules/block/block.admin.inc
@@ -35,7 +35,6 @@ function block_admin_display_form(&$form_state, $blocks, $theme = NULL) {
   $custom_theme = isset($theme) ? $theme : variable_get('theme_default', 'garland');
   init_theme();
 
-  $throttle = module_exists('throttle');
   $block_regions = system_region_list($theme_key) + array(BLOCK_REGION_NONE => '<' . t('none') . '>');
 
   // Build form tree
@@ -70,10 +69,6 @@ function block_admin_display_form(&$form_state, $blocks, $theme = NULL) {
       '#default_value' => $block['region'],
       '#options' => $block_regions,
     );
-
-    if ($throttle) {
-      $form[$key]['throttle'] = array('#type' => 'checkbox', '#default_value' => isset($block['throttle']) ? $block['throttle'] : FALSE);
-    }
     $form[$key]['configure'] = array('#value' => l(t('configure'), 'admin/build/block/configure/' . $block['module'] . '/' . $block['delta']));
     if ($block['module'] == 'block') {
       $form[$key]['delete'] = array('#value' => l(t('delete'), 'admin/build/block/delete/' . $block['delta']));
@@ -95,7 +90,7 @@ function block_admin_display_form_submit($form, &$form_state) {
   foreach ($form_state['values'] as $block) {
     $block['status'] = $block['region'] != BLOCK_REGION_NONE;
     $block['region'] = $block['status'] ? $block['region'] : '';
-    db_query("UPDATE {blocks} SET status = %d, weight = %d, region = '%s', throttle = %d WHERE module = '%s' AND delta = '%s' AND theme = '%s'", $block['status'], $block['weight'], $block['region'], isset($block['throttle']) ? $block['throttle'] : 0, $block['module'], $block['delta'], $block['theme']);
+    db_query("UPDATE {blocks} SET status = %d, weight = %d, region = '%s' WHERE module = '%s' AND delta = '%s' AND theme = '%s'", $block['status'], $block['weight'], $block['region'], $block['module'], $block['delta'], $block['theme']);
   }
   drupal_set_message(t('The block settings have been updated.'));
   cache_clear_all();
@@ -354,7 +349,6 @@ function template_preprocess_block_admin_display_form(&$variables) {
   global $theme_key;
 
   $block_regions = system_region_list($theme_key);
-  $variables['throttle'] = module_exists('throttle');
   $variables['block_regions'] = $block_regions + array(BLOCK_REGION_NONE => t('Disabled'));
 
   foreach ($block_regions as $key => $value) {
@@ -386,7 +380,6 @@ function template_preprocess_block_admin_display_form(&$variables) {
       $variables['block_listing'][$region][$i]->block_title =  drupal_render($block['info']);
       $variables['block_listing'][$region][$i]->region_select = drupal_render($block['region']) . drupal_render($block['theme']);
       $variables['block_listing'][$region][$i]->weight_select = drupal_render($block['weight']);
-      $variables['block_listing'][$region][$i]->throttle_check = $variables['throttle'] ? drupal_render($block['throttle']) : '';
       $variables['block_listing'][$region][$i]->configure_link = drupal_render($block['configure']);
       $variables['block_listing'][$region][$i]->delete_link = !empty($block['delete']) ? drupal_render($block['delete']) : '';
       $variables['block_listing'][$region][$i]->printed = FALSE;
diff --git a/modules/block/block.install b/modules/block/block.install
index 83bc7b8d170..23cb8f30ea0 100644
--- a/modules/block/block.install
+++ b/modules/block/block.install
@@ -62,13 +62,6 @@ function block_schema() {
         'size' => 'tiny',
         'description' => t('Flag to indicate how users may control visibility of the block. (0 = Users cannot control, 1 = On by default, but can be hidden, 2 = Hidden by default, but can be shown)'),
       ),
-      'throttle' => array(
-        'type' => 'int',
-        'not null' => TRUE,
-        'default' => 0,
-        'size' => 'tiny',
-        'description' => t('Flag to indicate whether or not to remove block when website traffic is high. (1 = throttle, 0 = do not throttle)'),
-      ),
       'visibility' => array(
         'type' => 'int',
         'not null' => TRUE,
diff --git a/modules/block/block.module b/modules/block/block.module
index c6e9ebd0bd0..3d4a9445057 100644
--- a/modules/block/block.module
+++ b/modules/block/block.module
@@ -72,7 +72,6 @@ function block_help($path, $arg) {
       $output .= '<p>' . t('When working with blocks, remember that:') . '</p>';
       $output .= '<ul><li>' . t('since not all themes implement the same regions, or display regions in the same way, blocks are positioned on a per-theme basis.') . '</li>';
       $output .= '<li>' . t('disabled blocks, or blocks not in a region, are never shown.') . '</li>';
-      $output .= '<li>' . t('when throttle module is enabled, throttled blocks (blocks with the <em>Throttle</em> checkbox selected) are hidden during high server loads.') . '</li>';
       $output .= '<li>' . t('blocks can be configured to be visible only on certain pages.') . '</li>';
       $output .= '<li>' . t('blocks can be configured to be visible only when specific conditions are true.') . '</li>';
       $output .= '<li>' . t('blocks can be configured to be visible only for certain user roles.') . '</li>';
@@ -81,11 +80,7 @@ function block_help($path, $arg) {
       $output .= '<p>' . t('For more information, see the online handbook entry for <a href="@block">Block module</a>.', array('@block' => 'http://drupal.org/handbook/modules/block/')) . '</p>';
       return $output;
     case 'admin/build/block':
-      $throttle = module_exists('throttle');
       $output = '<p>' . t('This page provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions. To change the region or order of a block, grab a drag-and-drop handle under the <em>Block</em> column and drag the block to a new location in the list. (Grab a handle by clicking and holding the mouse while hovering over a handle icon.) Since not all themes implement the same regions, or display regions in the same way, blocks are positioned on a per-theme basis. Remember that your changes will not be saved until you click the <em>Save blocks</em> button at the bottom of the page.') . '</p>';
-      if ($throttle) {
-        $output .= '<p>' . t('To reduce CPU usage, database traffic or bandwidth, blocks may be automatically disabled during high server loads by selecting their <em>Throttle</em> checkbox. Adjust throttle thresholds on the <a href="@throttleconfig">throttle configuration page</a>.', array('@throttleconfig' => url('admin/settings/throttle'))) . '</p>';
-      }
       $output .= '<p>' . t('Click the <em>configure</em> link next to each block to configure its specific title and visibility settings. Use the <a href="@add-block">add block page</a> to create a custom block.', array('@add-block' => url('admin/build/block/add'))) . '</p>';
       return $output;
     case 'admin/build/block/add':
@@ -474,7 +469,7 @@ function _block_load_blocks() {
  *   An array of block objects such as returned for one region by _block_load_blocks()
  *
  * @return
- *   An array of visible or not-throttled blocks with subject and content rendered.
+ *   An array of visible blocks with subject and content rendered.
  */
 function _block_render_blocks($region_blocks) {
   foreach ($region_blocks as $key => $block) {
@@ -483,26 +478,22 @@ function _block_render_blocks($region_blocks) {
       // Erase the block from the static array - we'll put it back if it has content.
       unset($region_blocks[$key]);
       if ($block->enabled && $block->page_match) {
-        // Check the current throttle status and see if block should be displayed
-        // based on server load.
-        if (!($block->throttle && (module_invoke('throttle', 'status') > 0))) {
-          // Try fetching the block from cache. Block caching is not compatible with
-          // node_access modules. We also preserve the submission of forms in blocks,
-          // by fetching from cache only if the request method is 'GET'.
-          if (!count(module_implements('node_grants')) && $_SERVER['REQUEST_METHOD'] == 'GET' && ($cid = _block_get_cache_id($block)) && ($cache = cache_get($cid, 'cache_block'))) {
-            $array = $cache->data;
-          }
-          else {
-            $array = module_invoke($block->module, 'block', 'view', $block->delta);
-            if (isset($cid)) {
-              cache_set($cid, $array, 'cache_block', CACHE_TEMPORARY);
-            }
+        // Try fetching the block from cache. Block caching is not compatible with
+        // node_access modules. We also preserve the submission of forms in blocks,
+        // by fetching from cache only if the request method is 'GET'.
+        if (!count(module_implements('node_grants')) && $_SERVER['REQUEST_METHOD'] == 'GET' && ($cid = _block_get_cache_id($block)) && ($cache = cache_get($cid, 'cache_block'))) {
+          $array = $cache->data;
+        }
+        else {
+          $array = module_invoke($block->module, 'block', 'view', $block->delta);
+          if (isset($cid)) {
+            cache_set($cid, $array, 'cache_block', CACHE_TEMPORARY);
           }
+        }
 
-          if (isset($array) && is_array($array)) {
-            foreach ($array as $k => $v) {
-              $block->$k = $v;
-            }
+        if (isset($array) && is_array($array)) {
+          foreach ($array as $k => $v) {
+            $block->$k = $v;
           }
         }
         if (isset($block->content) && $block->content) {
diff --git a/modules/statistics/statistics.module b/modules/statistics/statistics.module
index 3f43406b340..fcf99076599 100644
--- a/modules/statistics/statistics.module
+++ b/modules/statistics/statistics.module
@@ -59,7 +59,7 @@ function statistics_exit() {
       }
     }
   }
-  if ((variable_get('statistics_enable_access_log', 0)) && (module_invoke('throttle', 'status') == 0)) {
+  if (variable_get('statistics_enable_access_log', 0)) {
     // Log this page access.
     db_query("INSERT INTO {accesslog} (title, path, url, hostname, uid, sid, timer, timestamp) values('%s', '%s', '%s', '%s', %d, '%s', %d, %d)", strip_tags(drupal_get_title()), $_GET['q'], referer_uri(), ip_address(), $user->uid, session_id(), timer_read('page'), time());
   }
diff --git a/modules/system/system.admin.inc b/modules/system/system.admin.inc
index 8c9d0aa0ebf..c92ac2acb8f 100644
--- a/modules/system/system.admin.inc
+++ b/modules/system/system.admin.inc
@@ -588,7 +588,6 @@ function _system_is_incompatible(&$incompatible, $files, $file) {
 /**
  * Menu callback; provides module enable/disable interface.
  *
- * Modules can be enabled or disabled and set for throttling if the throttle module is enabled.
  * The list of modules gets populated by module.info files, which contain each module's name,
  * description and dependencies.
  * @see drupal_parse_info_file for information on module.info descriptors.
@@ -642,7 +641,6 @@ function system_modules($form_state = array()) {
 
   // Array for disabling checkboxes in callback system_module_disable.
   $disabled = array();
-  $throttle = array();
   // Traverse the files retrieved and build the form.
   foreach ($files as $filename => $file) {
     $form['name'][$filename] = array('#value' => $file->info['name']);
@@ -658,9 +656,6 @@ function system_modules($form_state = array()) {
     if ($file->status) {
       $status[] = $file->name;
     }
-    if ($file->throttle) {
-      $throttle[] = $file->name;
-    }
 
     $dependencies = array();
     // Check for missing dependencies.
@@ -736,21 +731,6 @@ function system_modules($form_state = array()) {
     '#incompatible_modules_php' => $incompatible_php,
   );
 
-  // Handle throttle checkboxes, including overriding the
-  // generated checkboxes for required modules.
-  if (module_exists('throttle')) {
-    $form['throttle'] = array(
-      '#type' => 'checkboxes',
-      '#default_value' => $throttle,
-      '#options' => $options,
-      '#process' => array(
-        'expand_checkboxes',
-        'system_modules_disable',
-      ),
-      '#disabled_modules' => array_merge($modules_required, array('throttle')),
-    );
-  }
-
   $form['buttons']['submit'] = array(
     '#type' => 'submit',
     '#value' => t('Save configuration'),
@@ -861,13 +841,6 @@ function system_modules_submit($form, &$form_state) {
     $dependencies = NULL;
   }
 
-  // Update throttle settings, if present
-  if (isset($form_state['values']['throttle'])) {
-    foreach ($form_state['values']['throttle'] as $key => $choice) {
-      db_query("UPDATE {system} SET throttle = %d WHERE type = 'module' and name = '%s'", $choice ? 1 : 0, $key);
-    }
-  }
-
   // If there where unmet dependencies and they haven't confirmed don't process
   // the submission yet. Store the form submission data needed later.
   if ($dependencies) {
@@ -2085,9 +2058,6 @@ function theme_system_modules($form) {
   // Individual table headers.
   $header = array();
   $header[] = array('data' => t('Enabled'), 'class' => 'checkbox');
-  if (module_exists('throttle')) {
-    $header[] = array('data' => t('Throttle'), 'class' => 'checkbox');
-  }
   $header[] = t('Name');
   $header[] = t('Version');
   $header[] = t('Description');
@@ -2127,9 +2097,6 @@ function theme_system_modules($form) {
         $status = drupal_render($form['status'][$key]);
       }
       $row[] = array('data' => $status, 'class' => 'checkbox');
-      if (module_exists('throttle')) {
-        $row[] = array('data' => drupal_render($form['throttle'][$key]), 'class' => 'checkbox');
-      }
 
       // Add labels only when there is also a checkbox.
       if (isset($form['status'][$key])) {
diff --git a/modules/system/system.install b/modules/system/system.install
index a8aa9d92767..6d9625774c6 100644
--- a/modules/system/system.install
+++ b/modules/system/system.install
@@ -1149,13 +1149,6 @@ function system_schema() {
         'default' => 0,
         'size' => 'tiny',
       ),
-      'throttle' => array(
-        'description' => t('Boolean indicating whether this item is disabled when the throttle.module disables throttleable items.'),
-        'type' => 'int',
-        'not null' => TRUE,
-        'default' => 0,
-        'size' => 'tiny',
-      ),
       'bootstrap' => array(
         'description' => t("Boolean indicating whether this module is loaded during Drupal's early bootstrapping phase (e.g. even before the page cache is consulted)."),
         'type' => 'int',
@@ -2852,6 +2845,21 @@ function system_update_7004(&$sandbox) {
   return $ret;
 }
 
+/**
+ * Remove throttle columns and variables.
+ */
+function system_update_7005() {
+  $ret = array();
+  db_drop_field($ret, 'blocks', 'throttle');
+  db_drop_field($ret, 'system', 'throttle');
+  variable_del('throttle_user');
+  variable_del('throttle_anonymous');
+  variable_del('throttle_level');
+  variable_del('throttle_probability_limiter');
+
+  return $ret;
+}
+
 /**
  * @} End of "defgroup updates-6.x-to-7.x"
  * The next series of updates should start at 8000.
diff --git a/modules/system/system.module b/modules/system/system.module
index 432881ef989..52c183a5e7d 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -73,11 +73,7 @@ function system_help($path, $arg) {
     case 'admin/build/themes/settings':
       return '<p>' . t('These options control the default display settings for your entire site, across all themes. Unless they have been overridden by a specific theme, these settings will be used.') . '</p>';
     case 'admin/build/modules':
-      $output = '<p>' . t('Modules are plugins that extend Drupal\'s core functionality. Enable modules by selecting the <em>Enabled</em> checkboxes below and clicking the <em>Save configuration</em> button. Once a module is enabled, new <a href="@permissions">permissions</a> may be available. To reduce server load, modules with their <em>Throttle</em> checkbox selected are temporarily disabled when your site becomes extremely busy. (Note that the <em>Throttle</em> checkbox is only available if the Throttle module is enabled.)', array('@permissions' => url('admin/user/permissions')));
-      if (module_exists('throttle')) {
-        $output .= ' ' . t('The auto-throttle functionality must be enabled on the <a href="@throttle">throttle configuration page</a> after having enabled the throttle module.', array('@throttle' => url('admin/settings/throttle')));
-      }
-      $output .= '</p>';
+      $output = '<p>' . t('Modules are plugins that extend Drupal\'s core functionality. Enable modules by selecting the <em>Enabled</em> checkboxes below and clicking the <em>Save configuration</em> button. Once a module is enabled, new <a href="@permissions">permissions</a> may be available.)', array('@permissions' => url('admin/user/permissions'))) . '</p>';
       $output .= '<p>' . t('It is important that <a href="@update-php">update.php</a> is run every time a module is updated to a newer version.', array('@update-php' => $base_url . '/update.php')) . '</p>';
       $output .= '<p>' . t('You can find all administration tasks belonging to a particular module on the <a href="@by-module">administration by module page</a>.', array('@by-module' => url('admin/by-module'))) . '</p>';
       $output .= '<p>' . t('To extend the functionality of your site, a number of <a href="@modules">contributed modules</a> are available.', array('@modules' => 'http://drupal.org/project/modules')) . '</p>';
@@ -899,7 +895,7 @@ function system_check_directory($form_element) {
  */
 function system_get_files_database(&$files, $type) {
   // Extract current files from database.
-  $result = db_query("SELECT filename, name, type, status, throttle, schema_version FROM {system} WHERE type = '%s'", $type);
+  $result = db_query("SELECT filename, name, type, status, schema_version FROM {system} WHERE type = '%s'", $type);
   while ($file = db_fetch_object($result)) {
     if (isset($files[$file->name]) && is_object($files[$file->name])) {
       $file->old_filename = $file->filename;
@@ -969,7 +965,7 @@ function system_theme_data() {
       $theme->owner = '';
     }
 
-    db_query("INSERT INTO {system} (name, owner, info, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', '%s', %d, %d, %d)", $theme->name, $theme->owner, serialize($theme->info), 'theme', $theme->filename, isset($theme->status) ? $theme->status : 0, 0, 0);
+    db_query("INSERT INTO {system} (name, owner, info, type, filename, status, bootstrap) VALUES ('%s', '%s', '%s', '%s', '%s', %d, %d)", $theme->name, $theme->owner, serialize($theme->info), 'theme', $theme->filename, isset($theme->status) ? $theme->status : 0, 0);
   }
 
   return $themes;
@@ -1155,8 +1151,8 @@ function system_initialize_theme_blocks($theme) {
       if (!array_key_exists($block['region'], $regions)) {
         $block['region'] = system_default_region($theme);
       }
-      db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, visibility, pages, custom, throttle, cache) VALUES ('%s', '%s', '%s', %d, %d, '%s', %d, '%s', %d, %d, %d)",
-          $block['module'], $block['delta'], $theme, $block['status'], $block['weight'], $block['region'], $block['visibility'], $block['pages'], $block['custom'], $block['throttle'], $block['cache']);
+      db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, visibility, pages, custom, cache) VALUES ('%s', '%s', '%s', %d, %d, '%s', %d, '%s', %d, %d)",
+          $block['module'], $block['delta'], $theme, $block['status'], $block['weight'], $block['region'], $block['visibility'], $block['pages'], $block['custom'], $block['cache']);
     }
   }
 }