Performances issues with Zorin Lite

[Aravisian]

A test for RAM that is quite simple would be to monitor RAM usage in real time, then clear it out when it surpasses 85% using:

[HOW TO] free up RAM while working

I just discovered this one... Sometimes, your RAM fills while you are working and it is not a good time to reboot. With three commands, you can clear out some RAM: sudo sync sudo sysctl -w vm.drop_caches=3 IMPORTANT!: You must run the following command again, or information currently in RAM that you are using and need could be lost sudo sync After running all three of the above, you should see a marked increase in Available RAM.

@Luca_Pavan

By the way, for those who know, is it normal to have so many identical or similar processes apparently doing the same thing with such high memory usage?

It can be, yes. Check the PID.
But it also is worth checking Brave Browser for a memory leak (Which would be an unsurprising outcome...)