A notification about file owner appears along with an FTP form, how can I resolve this?

The plugin uses PHP functionality to write to files, it cannot write or modify files it will give you a warning. Typically, you should tell your web host about the permission issue and they should be able to resolve it.

You can however try adding define(‘FS_METHOD’, ‘direct’); to wp-config.php to circumvent the file and folder checks. See this for more information of setting up file and folder permissions for WP

Changing File Permissions

Is WP-Optimize compatible with others cache plugins like WP Super Cache or W3 Total Cache?

Yes. You cannot use two page caches at the same time, and should not try. However, the WP-O page cache will only be switched on if you choose to turn it on; otherwise, it will have no effect on the site (either cacheing or performance). It is not turned on by default. Thus, WP-O can happily co-exist with other plugins.

(N.B. Also, because of how page cacheing works in WordPress, it is not possible to have more than one turned on at the same time; they might both think they’re turned on, but in effect, only the most recently turned-on will be doing anything).

Which web servers is WP-Optimize compatible with?

WP-Optimize is compatible with all web servers, including:

  • Apache
  • NGINX
  • Microsoft IIS
  • Litespeed
  • Lighttpd

However, only Apache makes it possible for a WordPress plugin to turn on Gzip compression and static caching headers; thus, on other webservers, WP-Optimize can only test and advise whether these beneficial features are active, but cannot itself turn them on.