Just got a small issue here. I did a RAM upgrade for my late 2011 MBP. However, it didn't work properly, like it's taking forever to empty my trash. I went to disk utility through RECOVERY interface, and did a disk repair. But it didn't solve the prob. So, I took out 8GB RAM, put back my original 4gb ram. The OS was still not working properly - same issue. I did a restore through Time Machine - taking my system back to the last saved point before I did the RAM upgrade. The OS was working properly, but I feel my computer is getting slower. I installed an app called "FREE Memory" to show the status of my RAM. It went down to 10MB if I open more than 4 apps. My system is freezing for a few seconds when the free RAM dropped to less than 50MB. Before I did the upgrade, my FREE RAM never went down to 300MB. Anyone have the same experiences? Any solutions? Thanks in advance.