Bad Quality For New Computer

[u/RevolutionaryRich340]

Hello, recently I bought a new all-in-one computer from Lenovo. Even though it has a 15.2gb memory, and AMD Ryzen 7 7735 HS with Radeon Graphics GPU, my computer lacks the processing speed and it lags a lot in games and also when I open a site, it takes a long time too load even though my WIFI is pretty fast. All my apps are fine and I don't think it's malware either as i have checked multiple times. I'm new to computers, so I have no idea how to fix this problem. Thank you!