Comment 12 for bug 733431

Actually, it seems to run quite smoothly in software as far as I could tell.
The biggest blocker to this would be the stability of the compositing code path in Metacity. There are quite a few critical bugs. GNOME's bugzilla has a potentially incomplete/outdated list of them:

https://bugzilla.gnome.org/buglist.cgi?bug_status=REOPENED&bug_status=NEW&bug_status=ASSIGNED&bug_status=UNCONFIRMED&bug_status=NEEDINFO&field0-0-0=component&field1-0-0=product&query_format=advanced&type0-0-0=substring&type1-0-0=substring&value0-0-0=Iain's%20compositor&value1-0-0=metacity&order=bug_severity,bug_id%20DESC&query_based_on=