I have a white 13" MacBook (late 2009) with 2GB memory. It is currently running Mavericks.
The machine is too slow, probably because the memory is just 2GB.
I'm considering downgrading it back to its original OS, which was Snow Leopard.
I bought Lion from the App Store when it came out, but I can't find it now, only Mountain Lion and Yosemite.
What would be the ideal OS X for this machine?
If it is Lion, how would I go about getting another copy, given that I've bought one once already?
What if I upgraded the memory to 4GB? (But installing new memory requires opening the machine up, which is not so easy.)