Why is repeated page load time 5 times faster?

[Marcus]

When I access a page for the first time, it is around 0.2-0.3 seconds from the xenforo debug time. When I access the same page another time, the time is reduced to 0.04 - 0.07 seconds. I wonder why. Is it because of APC cache, or is there an Apache cache?

 

[Insy]

APC.

 

[Marcus]

The fast view only works for a limited time, maybe within a half hour after the page was first loaded. After a half hour the page load is slow again for a first page view. How can I extend the time frame?

 

[CTXMedia]

Increase the size of APC cache and/or increase the Apache expires values.

 

[Insy]

There are several settings for APC: http://php.net/manual/en/apc.configuration.php.
In addition, you have other options if you have enabled the APC cache at XenForo's config.php: http://framework.zend.com/manual/1.12/en/zend.cache.frontends.html#zend.cache.frontends.core.

 

[Marcus]

Thanks, I have outcommented the zend cache frontent variable lifetime in my xenforo config.php

cache lifetime (in seconds), if set to NULL, the cache is valid forever

Dedicated APC cache is around 1 or 2 GB but it is only used for a fraction. I try to find out about the Apache cache.