I'm glad you succeeded at installing something lighter to replace Windows.
Have you search for buying more SODIMM RAM? Buying a 4 gig kit will allow for more room for things to run, and a 8 gig kit would allow the processor to run at full speed, assuming the graphics is also using up dedicated RAM space.
I've used Fedora Plasma and it never came close to using 8GB when using multiple problems, it can go a little over 4GB used. Even though it's a Celeron, the 8GB would allow everything to run freely at full capacity and use more of the processor instead of the processor wsiting on RAM and potentially swaping to the drive.
You can also look at GhostBSD if you want a default GUI desktop but want to try what FreeBSD can do.