I recently purchased L5 and like it. Lots to learn BUT I have noticed (on my Mac) alot of more spinning beach balls than on L4. Does L5 take significantly more computer resources? I don't run loads of concurrent progs when running L5. I have a 2008 vintage iMac ... 4G 667MHz SDRam, 2 GHz Intel Core 2 Duo. Not latest spec obviously but not too shabby.