[yash101]

I forgot to show the details running as root. This has a greater view of what is sipping up the RAM. Here are some more details (in the screenshot). I never work on optimizing the RAM! If you want, I can give you a list of all the packages installed on the Pi! That might give you a bit of info on where everything is going! Also, what processor do you have? My Windows 2000 machine is about as powerful as my Pi, maybe even more. The only problem is that it has only 256 MB of RAM! Do you use SWAP? That might help ease the RAM usage of the system!

I, myself, dislike caching because it is hard to make sure it is updated! For the good loading speeds, I use the accelerator, APC. It doesn't cache the HTML. It caches the code to make PHP execute faster. I use the WordPress plugin, QuickCache to cache the HTML. Since it is based on WP, it will automatically update when I add/change/remove content!