Desktop has gotten gradually slower since I bought it.

[ryeshe]

So this generally always happens but I'd really like to understand why and what i can do about it.
I assembled my desktop about 5-6 months ago and I used to get respectable 34-45 fps on assassin's creed 4 on the graphical settings I had. Now the max I get is 35 and it mostly stays at 25 going down to the 10s at times. I assumed I had too many programs installed or something and cleaned out anything i didn't need and also cleaned out my desktop completely. I've also cleaned the inside of my case regularly. Does hardware just get gradually slower or is there something i'm doing wrong?

 

[AxlMyk]

Anything in "Startup"? Just delete anything there that you don't want starting with the machine.
Get Ccleaner and run a registry check.
https://www.piriform.com/ccleaner/download

 

[ryeshe]

Other than a couple of stuff that came with the motherboard and antivirus no.. but they were all there to begin with so there's no reason for them to affect gaming performance. I installed Tuneup then read horrible reviews of it and uninstalled it immediately after. I made the ccleaner registry check and things haven't gotten better.