Code review comment for lp:~thumper/launchpad/fix-TestSharingMigrationPerformance

Its also a very expensive function to call. This is much more appropriate.

Small nit:
+from lp.testing import (
+ record_statements,
+ TestCaseWithFactory)

should be
+from lp.testing import (
+ record_statements,
+ TestCaseWithFactory,
+ )

as per the list policy in the wiki.