Title: compatibility check errors Last modified: October 8, 2020 --- # compatibility check errors * Resolved [iczek](https://wordpress.org/support/users/iczek/) * (@iczek) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/) * Hi, I did compatibility check and I can see the errorr below: * ` Server Modules & Resources: Plugin Version: 0.15.1 PHP Version: 7.3.20; Web Server: Apache FTP functions: Installed (required for Self-hosted (FTP) CDN support) Multibyte String support: Installed (required for Rackspace Cloud Files support) cURL extension: Installed (required for Amazon S3, Amazon CloudFront, Rackspace CloudFiles support) zlib extension: Installed (required for gzip compression support) brotli extension: Not installed (required for brotli compression support) Opcode cache: Installed (OPCache) Memcached extension: Installed Memcache extension: Not installed Redis extension: Installed HTML Tidy extension: Not installed ( required for HTML Tidy minifier support) Mime type detection: Installed (Fileinfo)( required for CDN support) Hash function: Installed (hash) (required for NetDNA/ MaxCDN CDN purge support) Open basedir: Off zlib output compression: Off set_time_limit: Available SSH2 extension: Not installed (required for Self-hosted (FTP) CDN SFTP support) deflate_module: Not detected (required for disk enhanced Page Cache and Browser Cache) env_module: Not detected (required for disk enhanced Page Cache and Browser Cache) expires_module: Not detected (required for disk enhanced Page Cache and Browser Cache) filter_module: Not detected (required for disk enhanced Page Cache and Browser Cache) ext_filter_module: Not detected (required for disk enhanced Page Cache and Browser Cache) headers_module: Not detected ( required for disk enhanced Page Cache and Browser Cache) mime_module: Not detected( required for disk enhanced Page Cache and Browser Cache) rewrite_module: Not detected (required for disk enhanced Page Cache and Browser Cache) setenvif_module: Not detected (required for disk enhanced Page Cache and Browser Cache) * I installed the plugin few days ago and run it but the website performance is still very bad. Is there any chacne that something blocks the plugin? - This topic was modified 5 years, 7 months ago by [iczek](https://wordpress.org/support/users/iczek/). Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13509857) * Hello [@iczek](https://wordpress.org/support/users/iczek/) * Thank you for your inquiry and I am happy to answer this. Not detected means you don’t use mod_php mode, so you probably use php-fpm. We cannot detect Apache modules in that case, but that doesn’t mean it is not installed/active. If you confirmed that all of the modules are installed/active there will be no issues with W3 Total Cache. As I said, this is only a detection method. As for the performance, test your website on Gtmetrix and configure the plugin accordingly. If you have issues with your images or the external resources, W3 Total Cache cannot help with this. For images, you should use some image optimization plugin like Ewww Image Optimization or Smush it. As for external resources, no plugin can handle those as external resources are not coming from your server. Thanks! * Thread Starter [iczek](https://wordpress.org/support/users/iczek/) * (@iczek) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13509905) * Marko, thank you! So I need to contact my provider to check it? I use GTmetrix and the resylts are very very low 🙁 However, the website itself works perfeclty well and super fast as for user 🙂 * I can see someting like that in my PHP settings: * php-fpm active Directive Local Value Master Value cgi.discard_path 0 0 cgi.fix_pathinfo 1 1 cgi.force_redirect 1 1 cgi.nph 0 0 cgi.redirect_status_env no value no value cgi.rfc2616_headers 0 0 fastcgi.error_header no value no value fastcgi.logging 1 1 fpm.config no value no value * Does it mean that I can not use W3C? - This reply was modified 5 years, 7 months ago by [iczek](https://wordpress.org/support/users/iczek/). - This reply was modified 5 years, 7 months ago by [iczek](https://wordpress.org/support/users/iczek/). * Thread Starter [iczek](https://wordpress.org/support/users/iczek/) * (@iczek) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13510003) * I’m affraid the problem is somthing else. I have another service and the compatibility has the same errors but plugin works well. Is there a chance that you take a look at the website to check wht the performance is so low…? * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13510023) * Hello [@iczek](https://wordpress.org/support/users/iczek/) * Thank you for the information. As I’ve mentioned before those modules are probably enabled so its only a matter of detection. You can share your website URL or the GTmetrix report and I can take a look at it. Thanks! * Thread Starter [iczek](https://wordpress.org/support/users/iczek/) * (@iczek) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13510211) * czasukropla.pl * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13512805) * Hello [@iczek](https://wordpress.org/support/users/iczek/) * As I can see from the test results, you should minify JS and CSS and possibly embed JS with in Performance>minify. If you however encounter any issues, you can switch to manual minify and add the files manually and in order. Thanks! * Thread Starter [iczek](https://wordpress.org/support/users/iczek/) * (@iczek) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13513386) * Marko, as you can see in html code of the page, this minify is already done but with no results on GTMetrix. I tested it and turn off the plugin then check GT Metrix and the results were exactly the same with plugin OFF and ON 🙁 So there is some problem with plugin because it does not matter if it is on or off, the results in GTMetrix are the same 🙁 - This reply was modified 5 years, 7 months ago by [iczek](https://wordpress.org/support/users/iczek/). * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13523920) * Hello [@iczek](https://wordpress.org/support/users/iczek/) * Sorry for the late reply. As I can see in the Gtmetrix [https://gtmetrix.com/reports/czasukropla.pl/snzIGGZW](https://gtmetrix.com/reports/czasukropla.pl/snzIGGZW) Now minifying is not needed. When you check the files that need to be minified you will see that all of them have .min. in the URL, meaning that those files are preminified. So in that case that cannot be minified again and it can cause issues if the files are double compressed. Thanks! * Thread Starter [iczek](https://wordpress.org/support/users/iczek/) * (@iczek) * [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13524253) * Unfortunately results are not so good now. I have many request and problwm wiht leverege browse caching. Any chacnce that you support me with plugin settings Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘compatibility check errors’ 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/) * [Frequently Asked Questions](https://wordpress.org/plugins/w3-total-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/w3-total-cache/) * [Active Topics](https://wordpress.org/support/plugin/w3-total-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/w3-total-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/w3-total-cache/reviews/) * 9 replies * 2 participants * Last reply from: [iczek](https://wordpress.org/support/users/iczek/) * Last activity: [5 years, 7 months ago](https://wordpress.org/support/topic/compatibility-check-errors/#post-13524253) * Status: resolved