But if you want to be really pro, go tu run msconfig.exe and disable not needed startup programs, leave only your firewall/antivirus and close the other processes you might not need using ctrl+ald+del, even explorer.exe you can remake it by using new task option, and don't load that program into memory, most user can understand why you don't need that in ram if you have prblems with performace, also lineage uses about 700mb per client so if you have 512 rest goes to pagefile wich means hdd, and that is slow, I recommend buying ram rest is less important
I don't recommend ever closeing your antivirus/firewall, better use something more lightweight like Comodo