Performance regression loading from fixtures in 1.1 & trunk

I have created a test that does nothing but read in a fixture of 10000
items.  
http://novalis.org/bugs/perf.zip

It goes significantly slower on Django 1.1-beta and trunk than it does
in Django 1.0.

1.0: Ran 1 test in 16.904s
1.1: Ran 1 test in 21.541s
trunk: Ran 1 test in 21.228s

My rejected patch in #11181 reduces each of these times to about 11
seconds.

If deserializer.base used force_insert (without my patch), it would cut
loading times down to about 6 seconds.  




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