Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b2pre) Gecko/20081105 Minefield/3.1b2pre Having a huge amount of tabs and opening the "all tabs" or ctrl-tab panel, the whole background shows as white until all the previews are calculated and can be painted. Either we should show the panel if it is already rendered or at least with the final background. Steps: 1. Holding down Ctrl+T for a couple of seconds until at least 50 tabs are open 2. Pressing Ctrl+Tab or click the all tabs button

Also the reaction on keyboard input (left/right/up/down) is getting slower when more and more tabs are open. Worth filing it as a separate bug or can the perf issues be covered in one bug?

Is this only on Vista? Also without Aero Glass (e.g. Classic)?

No, it's even visible on OS X as what I've stated on bug 465076 comment 9. So it's probably a core issue.

I can't reproduce this bug.

Marcia, do you have a chance to reproduce it? Probably it will only happen for slower graphic cards like I have in my MacBook and Mac Mini.

I am not able to reproduce exactly what you see. The more tabs I try to load in Ctrl-Tab, the slower everything gets on my Mac Tiger machine with 512 MB RAM. I get beachballs when I try to continually add tabs and I do see rendering issues on certain individual tab sites while the content is being fetched, but I don't see the whole background showing white. Currently I have 99 tabs open in this testing instance.

Marcia, it only happens while the panel is initialized/drawn. Afterwards it has the correct background. Are you using a MacBook or MacBook Pro?

I was running on a Mac desktop running 10.4.11 that only has 512 MB RAM. I did not see exactly what you were describing there on Mac, but I can try to repro on Vista. (In reply to comment #7) > Marcia, it only happens while the panel is initialized/drawn. Afterwards it has > the correct background. Are you using a MacBook or MacBook Pro?

Henrik, can you still reproduce this?

No, since we moved to several pages the white background cannot be seen anymore. But it's still damn slow. I will file a new bug. And please give me at least a day for my answer.