Description of problem:

Firefox has a serious performance issue when it needs to create a new window.

Visiting a site which pops up a separate window, or where you select a
conventional link to "open in new window" takes an inordinate amount of time.

Version-Release number of selected component (if applicable):

firefox-1.5.0.4-1.2.fc5

How reproducible:

Every time.

Steps to Reproduce:
1. visit any site that uses pop-up windows. Alternatively, visit any site, and
right click on any link and select "open in new window".
2. wait for up to 10 seconds for anything to happen.
3. run "top" and observe that "firefox-bin" consumes anywhere from 90-100% of
your CPU for the duration of the window-opening operation.

Actual results:

Up to a 10 second delay for the window to appear.

Expected results:

Near-instantaneous creation.

Additional info:

This behaviour has been observed on a number of different FC systems. In fact,
the problem is not confined to the latest version of Firefox. Additionally, the
problem affects any link where you select "open in new window".

I can accept that creating a new firefox window is going to be slightly slower
than creating a new tab, but not to this extent. This argument is backed up by
the fact that if you select a link to "open in new window", the firefox window
(navigation toolbar, status bar, window manager decorations, etc) renders in <1
second. However, there is then a delay in the order of 8 seconds on my current
system before firefox even attempts to render the page within the firefox windows.

10 seconds is one _heck_ of a lot of CPU cycles even on my (now relatively old)
2.5GHz Prescott (ie Hyper-threaded) Intel P4 chip with 1Gb of RAM on broadband...

I performed a fairly unscientific -- but nonetheless interesting -- comparison
with konqueror (from kdebase-3.5.3-0.3.fc5). On average whilst Firefox takes
between 8 and 10 seconds to create and render a page, konqueror takes 2 seconds. 

Dillo takes < 1 second if anybody is interested... :-)