Title: Where are missing extensions and code
Last modified: August 20, 2016

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# Where are missing extensions and code

 *  [gardenczar](https://wordpress.org/support/users/gardenczar/)
 * (@gardenczar)
 * [14 years, 12 months ago](https://wordpress.org/support/topic/where-are-missing-extensions-and-code/)
 * Just installed for the first time. I got a three point upgrade using google’s
   page speed webpage. I see in the compatibility test that I do not have Opcode
   cache, Memcache extension, HTML Tidy extension, Mime type detection installed.
   Also, mod_deflate:, mod_env:, mod_expires:, mod_headers:, mod_mime:, and mod_rewrite:
   are not detected.
 * I found several websites talking about HTML Tidy but I did not find the extension
   for W3 Total Cache. Where do I find all of these extensions and what are these
   mod_… things? Where do they go and what do they need with them? All I have found
   is literature on Apache servers and a test site to see if the blog is putting
   out gzipped files (which it is apparently). Sorry, I really do not know about
   this backend stuff.

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Contributor [Frederick Townes](https://wordpress.org/support/users/fredericktownes/)
 * (@fredericktownes)
 * [14 years, 10 months ago](https://wordpress.org/support/topic/where-are-missing-extensions-and-code/#post-2085224)
 * What is your web server and operating system?
 *  [Detlev](https://wordpress.org/support/users/detlev/)
 * (@detlev)
 * [14 years, 10 months ago](https://wordpress.org/support/topic/where-are-missing-extensions-and-code/#post-2085226)
 *  Plugin Contributor [Frederick Townes](https://wordpress.org/support/users/fredericktownes/)
 * (@fredericktownes)
 * [14 years, 10 months ago](https://wordpress.org/support/topic/where-are-missing-extensions-and-code/#post-2085227)
 * [@gardenczar](https://wordpress.org/support/users/gardenczar/) ?

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Where are missing extensions and code’ is closed to new replies.

 * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806)
 * [W3 Total Cache](https://wordpress.org/plugins/w3-total-cache/)
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 * 3 replies
 * 3 participants
 * Last reply from: [Frederick Townes](https://wordpress.org/support/users/fredericktownes/)
 * Last activity: [14 years, 10 months ago](https://wordpress.org/support/topic/where-are-missing-extensions-and-code/#post-2085227)
 * Status: not resolved