Server Update 1.8.3... Perforemance

Hello I am using the plex media server on a raspberry 3b as server and webplayer at once. With 1.8.1 i had some minor perforemance issues while loading big website (or clicking at the hole music libary tab) for a second ot two but all in all it was verry fine and did not took moore than 15% CPU (10% in average) while playing music. With the update the CPU time goes to an average of about 35-40% this is not so nice…
Listening to music and programming node-red is a pain now.
Should i renew the hole system?
What is causing this?

Kernel up to date - Raspbian stretch
and plexmediaserver was the 1 Package i updated.