Yes the high CPU usage almost confirms you are stuck in software
rendering mode. So that's expected.
Please try the pmap command again, remembering to use back-tick characters
(next to the 1 key):
pmap `pidof compiz` | grep _dri
Please also try to take another copy of .xsession-errors from during the
slow session. Because that's the log which will explain the fallback to
software rendering.
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https://bugs.launchpad.net/bugs/1249513
Title:
System graphics slow majorily after logout/login
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