Hack WP-Cache for Maximum Speed

Hack WP-Cache for Huge Speed IncreaseMarch 11th, 2008

« Speed Tips: Add Cache-Control HeadersUpdated robots.txt for WordPress »

If you desire SPEED from your WordPress blog, the #1 speed improvement comes from using the WP-Cache Plugin. However, if you still desire even more speed after installing the Plugin, you can modify the WP-Cache Plugin code run even faster!

WP-Cache Speed Hack Results

WP-Cache Off

WP-Cache Default Settings

WP-Cache With wp-cache-phase1.php Hack

WP-Cache With Full Hack

These results came from the Cacheability Checker. Yslow for firefox is what you need today.

Manual Instructions for hacking wp-cache

First you should download and activate the WP-Cache Plugin, then enable it in your Options Configuration Panel for WP-Cache.

Open wp-cache-phase1.php

Find

      /* No used to avoid problems with some PHP installations
      $content_size += strlen($log);
      header("Content-Length: $content_size");
      */

Replace with

 
      // BEGIN AskApache WP-Cache hack
      $content_size += strlen($log);
      header("Content-Length: $content_size");
      // END AskApache WP-Cache hack
 

Open wp-cache-phase2.php

Find

  /* Not used because it gives problems with some
   * PHP installations
  if (!$response{'Content-Length'}) {
  // WP does not set content size
    $content_size = ob_get_length();
    @header("Content-Length: $content_size");
    array_push($wp_cache_meta_object->headers, "Content-Length: $content_size");
  }
  */

Replace with

 
  // BEGIN AskApache WP-Cache Hack
  if (!$response{'Content-Length'}) {
    $content_size = ob_get_length();
    @header("Content-Length: $content_size");
    array_push($wp_cache_meta_object->headers, "Content-Length: $content_size");
  }
  // END AskApache WP-Cache Hack
 

Find

  if (!$response{'Content-Type'}) {
    $value =  "text/html; charset=\\"" . get_settings('blog_charset')  . "\\"";
    @header("Content-Type: $value");
    array_push($wp_cache_meta_object->headers, "Content-Type: $value");
  }

After Add

 
  // BEGIN AskApache WP-Cache Hack
  if (!$response{'Cache-Control'}) {
      $value = "max-age=$cache_max_time, public";
      @header("Cache-Control: $value");
      array_push($wp_cache_meta_object->headers, "Cache-Control: $value");
  }
  // END AskApache WP-Cache Hack

Download the Modified WP-Cache Plugin

Just download and install as if it were the actual WP-Cache Plugin.wp-cache.zip | wp-cache.rar

Want More Speed?

Then check out the other speed articles on AskApache.

• Turn On Compression
• Add Future Expires Header
• Add Cache-Control Headers
• Turn Off ETags
• Remove Last-Modified Header

Or just add this to your blogs .htaccess file.

#           HEADERS and CACHING
# 1 YEAR
<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
Header set Cache-Control "public"
Header set Expires "Thu, 15 Apr 2010 20:00:00 GMT"
Header unset Pragma
Header unset Last-Modified
Header unset ETag
FileETag None
</FilesMatch>
 
# 2 DAYS
<FilesMatch "\.(xml|txt)$">
Header set Cache-Control "max-age=172800, public, must-revalidate"
Header unset Pragma
Header unset Last-Modified
Header unset ETag
FileETag None
</FilesMatch>
 
# 2 HOURS
<FilesMatch "\.(html|htm)$">
Header set Cache-Control "max-age=7200, must-revalidate"
Header unset Pragma
Header unset ETag
FileETag None
</FilesMatch>
 
# COMPRESSION
<FilesMatch "\.(js|css)$">
SetOutputFilter DEFLATE
</FilesMatch>

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