Actually, if you read what memory compression does you'll find out that it uses your CPU to relieve some of the pressure from RAM. This is great with a newer computer that has a fast CPU but if you're like me and using a 2.66 Ghz i5 processor you'll find that it makes your life slower than without compression.
I took a chance and turned compression off using Terminal and my machine is MUCH faster now. All I have to do is watch Memory Usage just like I used to and restart Photoshop when it gets filled up since that's always the big hog for me.
You can google "turn off memory compression" and you'll find the code to pop into your Terminal. There's probably some risk of file corruption but I don't store mission critical files on my system drive and use Time Machine so I feel that the speed is worth the risk until I upgrade my machine.
I do miss the piechart though and wish I could get it back.