Hello. I have a 2GB Droplet and I have problem with high CPU usage when someone is on the website. The site is running on Apache2 and Prestashop. When site is online the CPU usage is 1-2%, but When somebody will enter on the site, the CPU usage by Apache2 is 60-70%.
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What version of PHP are you running? If you’re running PHP 5.6.x, you might consider enabling OPcache with a configuration like this:
Also, lower your KeepAlive timeout, and follow the documentation here for a performance boost:
http://doc.prestashop.com/display/PS16/Performance+Parameters