Quote:
Originally Posted by
Tallest Skil 
How'd you manage 5GB of RAM?
4 + 1 = ? (iPhone 5) : P
It probably shipped with 2 x 1GB so buying a single 4GB DIMM takes it to 5GB.
Quote:
Originally Posted by Vorsos
If that's the case, it's most likely non-matching RAM
The RAM upgrade was done to counter the slow-down caused by the Lion upgrade though. Non-matching RAM would affect integrated graphics but anything else should be ok.
I'd say start in safe mode by holding shift and see if apps still have the slow down then reboot back into normal mode. If the slow down persists, try making a new user account and see if it's any better. If there is still no improvement check the console log to see if something is dumping error messages.