My 17" MBP has a 4GB RAM and lately I've noticed when opening applications it will bounce for a while before it opens. For example: firefox bounces 8 times, photobooth bounces 5 times, word bounced 10 times, photoshop bounces 8 times, iphoto bounces 4 times, itunes bounces 3 times. But I swear before they were all usually just 2 bounces and it would open. I did a PRAM and SMC reset but I still get the same thing happening. What does the bounce mean?