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Optimize spare RAM

bigfoot123

New Pleskian
12.5 running at DigitalOcean on the 4CPU/8GB plan Ubuntu 14.04. I originally upgraded to this one from the 4GB plan because I needed additional storage space but not so much anymore. I'm hosting about 10 WordPress sites using FPM through Apache for PHP processing. Sites range from 500-25K visitors per day.

I hover around 6GB free of RAM at any one time and I'm looking to utilize this better because it seems like such a waste just sitting idle. There's tons of threads on people running out of memory but in this case my cup runneth over.

What are some things I can do to get more bang out of this extra RAM that is never in use?
 
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