Lion slow response - seems disk related
I am getting very slow UI response in Lion. (iMac 27", 3 GHz, dual core i5 processor, 8 GB ram, 250 GB free on HD). SmartReporter says disk is operating in spec (ie no alarms). Opening disk folder takes 5 seconds to get a spinning beach ball, with another 5 or more seconds to get the folder open. Also slow on directory scan during file opening dialogs. Even get the delay when opening USB drives.
OS 10.7.3, with Apache running, and the usual load of extensions operating. But what I find irritating is that Activity Monitor reports CPU at 25 %, HD occassionally spiking to 100%, but not often, and still I seem to get these unexplained delays. Not fun. Turned off 'disk sleep' in energy saver preferences. Seemed to help for a while. Now not. Reinstalled OS X twice from store and with a USB download stick. Get wierd errors on Console: "5/6/12 5:20:31.000 PM kernel: IOSurface: buffer allocation size is zero".
Killing Safari/Flash via Activity Monitor makes a small amount of speed difference, but not much.
Any comments? Suggestions? Is this a general issue with Lion? Are there any profiling S/W diagnostics that might suggest where the processor is spending its time?
Nick
iMac, Mac OS X (10.7.3), slow UI response, slow disk