I can confirm that an extension can have this effect. I saw this with https://addons.mozilla.org/en- US/thunderbird/addon/quickarchiver/
When I disable the extra column it adds the scroll speed is back to normal. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/38054 Title: message list slow scrolling Status in Mozilla Thunderbird Mail and News: Confirmed Status in “thunderbird” package in Ubuntu: Triaged Bug description: Hi! I'm on kubuntu dapper and using thunderbird as mail program. When scrolling the message list of a folder, I have redraw rates of about 5 to 10 redraws per second. In other words: The list scrolls very slow and is very unresponsive. CPU goes up to 100% while scrolling. I tested this with a empty profile just filled with about 100 mails in the local inbox. No extensions, no themes, no IMAP connections, no nothing. I tested this with vanilla thunderbird downloaded from mozilla.org, too and there the problem shows up, too. So it might be related to something else I don't see yet. I changed my GTK theme to default instead of gtk-qt. Looks ugly, but problem still persists. Interestingly when scrolling the message preview pane or an opened message, scrolling is smooth, fast and very responsive. So graphic and rendering subsystems cannot be involved into the source of the problem I think. Before testing dapper I used thunderbird on SuSE 9.1 and there were no problems scrolling in message lists up to 20.000 mails. So it should be able to do that fine on dapper, too. My hardware is absolutely sufficient (Athlon XP 2800+, Geforce 6600 GT, nvidia closed source driver configured correctly) Any ideas? Best, Daniel To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/38054/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
