You’ll likely lose some frames by switching to Linux but not much. It really depends on the games you are playing. Check ProtonDB for some of them

What kind of pc do you have? Is it a pre-built, a laptop, or is it a custom build desktop?

Also, what kind of games are you planning on playing?

You should definitely give it a shot! Due to proton, you should be able to play most, if not all, of the games you play om windows (unless they have obnoxious anticheats). A good resource for checking game compatibility on linux is ProtonDB. In terms of performance, there will almost certainly be a slight impact, but in my experience (with an admitingly far more powerful gpu) it really is minimal. And if it really doesn’t work out, you can always go back to windows.

Can I be able to play the games that Windows supported without losing frames?

It depends on which games in particular, some games actually have higher framerates in linux, but you will likely lose a couple frames, not much though. If you have your games in Steam it’s pretty easy to just enable Proton to play everything, you can check protondb.com to see how well each game works and possible performance options. You will likely need to install the nvidia linux graphics driver for good performance on your nvidia card, most linux distros default to the open source nouveau driver, which doesn’t perform as well, but there are distros that include the nvidia driver on install like Pop!_OS and Mint