Have the new MBP 2.3Ghz, 4GB RAM. I only have Google Chrome and iTunes running usually. I close heavy applications such as Photoshop and Illustrator before closing the lid. Sometimes when I wake it up, some functions such as switching desktops (Lion) and opening new tabs, folders etc. are slow for about 10 seconds. Then it goes back to normal. I don't think it's the RAM as 4GB is way more than enough for such simple functions. I had the 2008 Unibody MBP before this and it had no such issues.