Lite Speed Server Installed, Site have great velocity, but come back to old velocity after 30 minute

Hi i'm new using Lite Speed Server.
I installed it in a VPS at
(vps 4gb), and worked good, the website speed in a google test jumped of 72 to 86, good upgrade!

But after 30 minutes, the velocity of the website, come back to the normal vps speed :/

The website is a Magazine website style:
, after the litespeed activation the speed of the website has very good, but, i don´t know, what make the website, regret to old speeds.

If anyone can help me, have my thanks :)
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