[zope2-tracker] [Bug 143657] Re: ExtensionClass misses ZODB persistent reference optimization

[Hanno Schlichting]

I've been able to verify the effect by instrumenting the
FileStorage.load with a simple counter.

For a current Plone 4.0a5 site the differences are in the hundreds of
fewer databases loads. Simply loading the front page for the first time
requires about 700 instead of 2000 database loads. Adding a page for the
first time still required 230 vs. 100 loads. Over time this effect drops
off when the ZODB cache is filled up. The effect will be more noticeable
in production sites where objects are frequently not in the cache.

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ExtensionClass misses ZODB persistent reference optimization
https://bugs.launchpad.net/bugs/143657
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