I found that we could speed up mail to take 1/6 of the time to load headers if we remove the call to UpdateSummaryTotals in OnAddKey. The side effect of this is that message counts won't appear correctly in the folder pane and that styles in the thread pane don't show up correctly until you mouse over the affected header. But I think both of these side effects are worth introducing and figuring out later to get the speed gain.

I checked in a fix for this.

If you fix this for M6, we'll need to document the side effects in the release notes. Thanks.

Par or Suresh, can you verify this in the code?

Scott - in which file(s) is the fix? Par

base\util\nsMsgDBFolder.cpp in the function OnAddKey. I just commented out the call to UpdateSummaryTotals. You'll only see the difference if you have to reparse your mailbox folder.

Putting on [Perf] radar

Current code shows: NS_IMETHODIMP nsMsgFolder::UpdateSummaryTotals() { //We don't support this return NS_OK; } VERIFIED as acceptable code