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I noticed a major slowdown on 2.2.2 Android, and it looks as though it's caused by too many logcat processes. With adb shell, I ran ps | wc -l and there were about 400 processes, after running killall logcat I ran the ps count again and there were around 200.
Even something as simple as ls would take like 10 seconds before, and after cleaning up all those Logcats it was instantaneous.
Is this a known bug in Android?
It's a known issue with the Applocker app: http://code.google.com/p/applocker/issues/detail?id=8
It creates too many Linux processes, causing devices to slow way down due to lack of memory.
adb shell "ps|grep logcat"against my device, and it returned nothing (crosschecked, not a single logcat process running). Maybe something specific to your device/ROM? Or to what you where doing just before?