Reasonably high memory usage on VPS

I am hoping to migrate all of the websites on my VPS away from W3TC due to it not being updated for WP4.4 – it seems to have just been dropped unfortunately.

So, I am going to give Super Cache a go, however, on one of the sites which have around 100 blog posts and a few post types etc, it does seem to have used a fair amount of memory on the server.

I understand whilst preload is going on, this will use a bit but I have set the garbage collection and preload renewal to be a few days so once that initial preload is complete, it should be pretty low on consumption.

I am using mod_rewrite to serve the pages if this makes a difference.

I only really used Page and Object cache on W3TC along with their Varnish server purge tool, I found I never needed anything else!

More information to help people – VPS running 2GB Ram – around 15 WP installs and currently used around 30% memory, 20% swap and hardly any CPU usage.

Since installing Wp Super Cache on one install, memory has gone up to around 55-60% memory usage with ~25% swap.

Software – Apache (cPanel etc), PHP 5.5 with FPM with Varnish.

Any suggestions would be great!

I have looked to see if other people had experienced high memory usage issues however none were recent so thought they wouldn’t apply to the current version!