Try this:

- go to TB menu > Settings > General

- scroll all the way down and click the 'Config editor' button on the right

- click 'Accept the risk and continue'

- search for accessibility.force_disabled > change the value to 1 > click the check mark

- restart TB

It is a bit quicker in finding the name, but it's not as instantaneous as it used to be. Thanks for the advice.

Is it any quicker in in Troubleshoot mode?

That link doesn't work. I'm in the UK.

That link doesn't work. I'm in the UK.

Sorry, my fault - try it again.

Exactly the same. I should have mentioned before that the program takes a good 5 minutes to load the inbox after starting up. Thanks again.

Exactly the same. I should have mentioned before that the program takes a good 5 minutes to load the inbox after starting up. Thanks again.

A few things to try. Do one at a time and test:

Clear cache: - press Ctrl-Shift-Delete - set 'Time range...' to 'Everything' - untick all items except 'Cache' - clear, then restart TB

Rename a program file: - TB menu > Help > Troubleshooting Information - under the Application Basics section next to Profile Folder, click 'Open Folder' - close TB - rename addonStartup.json.lz4 to addonStartup.json.lzx - restart TB

Change proxy settings: - TB menu > search for proxy > click 'Settings' button > try the other settings

Disable hardware acceleration: - TB menu > Settings > General > scroll all the way down and disable hardware acceleration

Apologies for delay, have tried all of these and the problem remains. Thanks for your help.

Apologies for delay, have tried all of these and the problem remains. Thanks for your help.

Try a new profile.

I would not expect cache to be a factor here. If Troubleshoot mode did not help, then we should expect something address book related.

Disable addressing matches by unchecking the composition settings seen in the screen shot. What are your results?

It is a bit quicker in finding the name [with accessibility.force_disabled > change the value to 1], but it's not as instantaneous as it used to be. Thanks for the advice.

I just noticed this.

So if you indulge us to reconfirm this effect, please change it back to 0 - does the performance gets worse?

Also, what are the total number of contacts in your address books? Are any of them carddav or ldap?