If you have folders with many emails inside, Indexing can slow down Thunderbird. Install the 'NoGlass' Addon which is available in the Thunderbird addon repository. If it is still slow, try the next options:ĭisabling the AeroGlass interface makes the interface reacting much faster. The following steps helped me to speedup Thunderbird so that it got usable again.Įdit Thunderbird options under Preferences → Advanced → General tab, click on 'Advanced options' button and set these values:Īnd restart Thunderbird. No other applications on my System were slow and the notebook has afast harddisk and SSD, so this was not the problem.

Sometimes I could see the chars appearing slowly on the screen while I typed the email or it was impossible to drag & drop a email to a different folder because Thunderbird was stalled for 10-15 seconds. After entering that, everything seems OK now.I've experienced that Thunderbird has gotten slower and slower on my Laptop, at last it was nearly unusable. Success!!!! When I switched my outgoing server BACK to on port 465 (from 587), a window popped up ( it hadn't popped up previously) that asked for my comcast email password.

Is there a conflict here, that is prohibiting a new installation of my Windows 10 machine? New installation of Thunderbird (no detailed folders now) Windows 11 PC Old original SSD now on a new (secondhand) ancient Fujitsu laptop: These are the details of the existing copies of Thunderbird currently working: Probably wrong configuration, I thought it may have something to do with the Server Settings. In trying to find a solution, why I cannot currently set up a new account on my Windows 10 PC - error message yellow warning sign: Unable to login in at server.

Mozilla thunderbird profile location windows 7