Yuppie already has considerable sped up "listFilteredActionsFor"
for CMF 1.5. However, even after his optimizations "listFilteredActionsFor"
can still consume lots of time.
I found simple situations where it had spend more then 10 percent of
total request time in "testCondition".
I propose to make the category lists lazy objects that perform
condition and permission evaluation only when they are accessed.
This means that action categories not used on a specific page
would not have the expensive "testCondition" evaluated.
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