@James,

I suggest you to compile APC for your PHP 5.6 version to /opt/plesk/php/5.6/etc/php.d directory.. This is the only solution, I think.

I installed that with Plesk and the path to the php.d directory is /opt/plesk/php/5.6/etc/php.d. I tried placing the apc.ini file there, but that didn’t work. I also tried adding the directive “extension=apc.so” directly to that PHPs php.ini file. It’s still not running.

Do you have any advice to get this working?

I am working on one of my client’s project scislides.com which loads up very very slowly. I was going through the possible fix and came across below one but not sure whether this would work or not. Can somebody help?

How to fix – Page Cache Test (Server Side Caching)

In order to pass this test, you are advised to use a caching mechanism for your pages. There are three methods which can be used to caching your web pages:

Alternative PHP caching
– Alternative PHP Cache (APC) is an open source framework which caches data using intermediate PHP code. Most web programmers who are familiar with the PHP programming language can easily set up Alternative
PHP Cache for your site.
Quickcache
– Quickcache is a lightweight page caching solution which was formerly known as jpcache. Quickcache caches the page output rather than compiling the PHP page, making it a superior version of page caching to the Alternative PHP caching. Quickcache can be quickly downloaded from their website and can reduce your page load time up to 80%.
WP Super Cache
– If you have a WordPress website, WP Super Cache can be installed within seconds and without no programming knowledge.

Regards
Mary Rax

@Alessandro,
I am sorry but apc deprecated, now you should use opcache with PHP 5.4 onwards for better and faster performance..