[imp] message cache performance / parseAddressList

[Matthew Dunham]

Folks -

So I'm looking at cache performance in 4.2.1RC1. Once I've logged in and 
my mailbox cache has been populated, I still see IMP_UI_Mailbox->getFrom 
spending running parseAddressList every time I refresh a mailbox page.

It looks like the PEAR Mail_RFC822 parser is just doing a buncha address 
validation, but it's rather expensive performance-wise Is there any 
reason the getFrom stuff isn't cached? Can it be?

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|||||||||||  Matthew E. Dunham
|||||  Instructional Computing
||||||||||||  UC Santa Barbara
||||||||||||||||  805 893 7687