PC is slower than usual?

I3-8100, GTX 1050 (overclocked with msi afterburner), 465GB HDD and 222GB SDD (weirdly specific amounts for storage idk why)

recently noticed my pc is slower than usual (opening apps take longer (even task manager), doing random stuff like replying to messages freezes the computer, even choosing the flair for this post froze the pc for a good 5 seconds)

task manager says my cpu takes around 66%-100% when playing games like roblox or payday 2 (no mods and around mid-high graphics)

the thermal paste is still kinda new i guess (around 2-3 ish months since i last changed it i think)