Somewhat good PC getting frequent lags on simple tasks

My desktop PC have a somewhat good building, but is lagging like hell. When I switch between programs for example it can sometimes take like 5~10 seconds. Even switching between tabs on browser Edge can take some time. I dont understand why, can someone enlighten me?

Specs: i3-10100 16GB RAM DDR4 2666MHz GeForce GTX 1650 DDR6 SSD SATA 500GB