After sleep, my iMac is very slow to respond for a 45seconds+ When my iMac enters sleep, and then I wake it up -- either shortly after, or the next day, while it responds to the wake request quickly, it's basically unresponsive for 45 seconds+ after.

Specifically:


Opening a new window for safari (which was still running on sleep) takes forever
scrolling in mail will show blank space
bringing up Alfred can take a while


Things to note:


Late 2010 i7 iMac w/ 1TB disk &amp; 8gb
Mavericks w/ all updates applied
HD is audibly being hit aggressively


Is this a known issue, and if not, can I run some tools to tell me who is accessing the hard disk.

At this point, I'm considering a new computer, but it seems odd that a i7 w/ 8gb is becoming pretty useless for light email &amp; browsing. :)
Leave the Activity Monitor open and visible so that when you wake, you'll be able to see the memory/cpu hogs.