"In some of my grids, deleting an item is a long process : takes 23s before the deletion dialog appears + CPU = 100% (1 core) "
This was mentioned a long long time ago (Performance problems with auto assign rules, inheritance, item deletion. : this comment : http://www.sqlnotes.net/drupal5/index.php?q=node/1488#comment-6532). I think you should be able to reproduce it easily in the DB I sent you (which is still available on "Shared SQLNotes" dropbox foilder).
(P.S. : reminder for te long time inheritance bugs too... ;) )
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