Question Pc laging/stuttering when in game

[novajetfire333]

I just built this gaming pc last august.... and now when ever im gaming i get lag or stutter?sluggishness even if i alt tab out of the game the mouse is moving slugishly on the screen ( not choppy movement just really slow) im not over heating and my cpu shows it pinned at 100% and it shouldnt be for the games i play like halo wars 2 and borderlands 1 2 and pre sequel i sit just around 50% useage i cant figure out what it is ive cleaned the dust out,ran anti virus,malwarebytes, scaned the disks,defraged the hard drives and trimmed the ssds. what else can i check short of dissembling the whole pc......
Ryzen 5 2400g
patriot viper ram oc 3200 ( been stable for almost a year)
xfx rx 580 xxx edition
asus prime b45m-a
thermaltake smart 500w psu

 

[helpstar]

update the BIOS to the latest version

update windows

how hot is the CPU and at what frequency is the CPU while lagging?

Did you overclock the CPU? GPU?

firmware of the SSD is up to date?