How to speedup slow Mozilla Thunderbird email client on Windows 7?
The following steps will help you to speedup Thunderbird so that it got usable again. Set some interface options Edit Thunderbird options under Preferences → Advanced → General tab, click on "Advanced options" button and set these values: layers.acceleration.disabled = true and gfx.direct2d.disabled = false and restart Thunderbird. If it is still slow, try the next options: Disable AeroGlass Disabling the AeroGlass interface makes the interface reacting much faster. Install the "NoGlass" Addon which is available in the Thunderbird addon repository. Disable Folder Indexing If you have folders with many emails inside, Indexing can slow down Thunderbird. Go To Preferences → Advanced → General tab and disable the Global search. Antivirus scanning of the Email folders in the filesystem A antivirus scanner can slow down Thunderbird as well. Configure your antivirus program to exclude the Thunderbird Mail folders from being scanned. Warning: this option should only be us...