You may find that upping the RAM will give you 12 months peace and much improved performance. Memory is so cheap these days and often extends the useful life of a PC. Especially if you can crowbar it out and flog it afterwards.
Try doubling your memory. If you have a 1.2 then given a guess at its age and likely config, you may well have 256 on board. Double it! If 512, still double it! If 128, throw the 128 away and fit 512.
Conan