My games have dropped in fps?

Vtoday i was playing rust and noticed that instead of about 30-50 fps i was getting 10-15 fps and it is very hard to kill someone on that kind of fps. CSGO dropped from 80 to 60 and minecraft was going from 75 to 15! I know something is wrong because i put rust on fastest and beautifal and still get the same fps?

I have a GeForce 750 TI

Have you restarted your computer lately?

Too much processes in the background. Kill them using task manager.