Too many copies and allocs are happeing. We should figure out usage patterns and improve performance.

Set target milestone to M4. John, do we need to fix this soon?

I have already made some changes that will help this problem: reference counting, plus some new path concatenation operators on nsFileURL and nsFilePath (previously only on nsFileSpec), which will mean that it won't be so necessary for people living in the URL world to convert back and forth between URL and spec. I don't think it's urgent, though dp might disagree. As long as I promise to check this stuff in at some point, I hope dp's worries are allayed.

DP, please try it again now. Lots of performance improvements. You can use the code I suggested in my email now, concatenating directly to the nsFileURL. Marking fixed, but if you see more problems, I know you'll reopen it.

Win and Mac holding their own against IE (even without Necko in yet). Linux has gotten better from a user perspective (no auto performance tests yet). Marking Verified. Performance is monitored weekly.

Moving all Apprunner bugs past and present to Other component temporarily whilst don and I set correct component. Apprunner component will be deleted/retired shortly.