Looking at this post: There is a certainty that some games such as TF2 will not run better on Linux when compared to Windows. In TF2's case, this is because it lacks Vulkan support on Linux, so it is running on emulated Open-GL.
There is also a problem with older Intel / AMD integrated graphics cards that happen to run with terrible performance on Linux as I have personally experienced with a previous computer in the past running Ubuntu with a AMD E2 Vision CPU. If you really want to know, test it in Windows to see if it runs at least 60 FPS, then create a partition for a Linux distro of your choice and try it there to see whether the performance actually changes.
I recommend that later down the line, get a laptop with a decent dedicated GPU or at least a laptop with one of the more powerful modern AMD/Intel iGPUs if you can. From my experience, they run a lot better than a lot of the older iGPUs that I had to deal with in previous laptops.