APCu

[Mike]

Hello Nizam

It's recommended to use latest php version for better performance (php 7.1)

Yes in caching method APC - APCu used and you can install it from PECL if not available, you can try it, but as for me it will not give you noticeable improvement.

[Nizam Karim]

Many thanks for you recommendations . We have small vps, using ubuntu 14.04 /php 5.6 w 768 gb ram
don't want to stress srvr so also using nginx reserve proxy
Would prefer to use apps ( flynax) caching rather than nginx caching
Kind Regards