Lion Slow Wake Up from Sleep

My only suggestion is that Apple needs to make some bug fixes to Lion. My Mac Pro 3.2ghz Quad Core with 10GB of RAM is also very slow to wake from sleep after upgrading to Lion. Used to be about 5 seconds to wake from sleep. Now it's like 20-30 seconds, and like yours, sometimes it doesn't wake and goes right back to sleep. Also, while it's in this "waking" state, the cooling fans are screaming at top RPM.

Exact same issue here. I have a Mac Pro 2.8 (mid 2008) with 20GB RAM, and since the Lion upgrade, it wakes up very slowly (approx 40 to 60 seconds), and sometimes drops back off to sleep before the login screen appears.

The fans go full power for much longer than they used to do in Snow Leopard, which gave a quick blast then woke up pretty silently after that.

I am genrally getting various issues, and have posted another thread re. not being able to calibrate dual monitors with Lion, and Screenflow not recording from the scondary monitor.

There are many bugs in this first release of Lion. I wish I had held back. I never expereinced anything like this when I went from Leopard to Snow Leopard.

Serious considering reverting back to SL, but not certain I will not loose things along the way.

I seem to have fixed this issue. I ran Disk Utility and it showed error in the file structure. I rebooted into to Lion Recovery partition and ran Disk Utility, did a repair, and now (for the time being) it wakes as expected without all the whiring fans and falling back off to sleepland.

One gotcha with the recovery partition boot is that it doesn't recognise Magic Mouse, and I had to dig out my USB mouse.

Hope this info is of some help.

Disk Utility didn't work for me. I posted a different fix that relates to hibernation mode that wight work for other people. See my (lengthy) post and give it a try to see if that works for you:

https://discussions.apple.com/thread/3198244?answerId=15950593022#15950593022