I have an old faithful first gen MBA (1.6/80GB) running Leopard 10.5.8 as my bedside Mac. Unfortunately I am spending more time at the beach lately and not enjoying the scenery, just lots of spinning beach balls. Seems the latest anti-malware stuff has really slowed it down. What OSX is fastest for light Word/Excel and Firefox use? - Leopard - currently installed, may just rebuild to speed up - Snow Leopard - had this on before. Didn't seem much better - Lion - no features I need Thanks!