This will probably be a long post. I have a eMac 1GHz USB 2.0 model with ATI Radeon 9200 graphics. I have 1.5GB DDR RAM and a 120GB WDC 7200RPM Upgraded HDD and a upgraded SuperDrive from a PowerMac G5. i do not have the money for RAM nor do i want to put any more money into this thing so here is where it gets complex: I installed Mac OS X Tiger on this eMac I have been running Leopard on it since i bought it. Reason i put Tiger on it was because i have read it is much faster than leopard. I have a External HDD hooked up i use for Classic Environment and quite enjoy using Outlook Express 5 via Classic. But i still think i can do better i do not want to downgrade to Panther mainly due to it having next to no compatible software anymore that and i dont have a copy of Panther. So i was thinking maybe installing Ubuntu 12.04LTS on my eMac i have done it before but am cerious which is faster on my specs Tiger, Leopard or Ubuntu?