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Thunderbird lagging when I copy & paste

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hello all, I hope you can help with this. I am on a mac, OS High Sierra, 10.13.2 using Thunderbird 52.5.2. A few days ago Thunderbird started lagging. It's especially noticeable when I copy and paste any text - there is a /long/ lag with a spinning wheel.

So far I have:

- restarted - deleted downloads - emptied trash - ran disk utility - ran disk utility from boot disk - updated OS - checked Activity Monitor - no unfamiliar apps running - disabled all Thunderbird extensions - disabled Thunderbird shockwave Flash

Help please! thanks, Sandy

hello all, I hope you can help with this. I am on a mac, OS High Sierra, 10.13.2 using Thunderbird 52.5.2. A few days ago Thunderbird started lagging. It's especially noticeable when I copy and paste any text - there is a /long/ lag with a spinning wheel. So far I have: - restarted - deleted downloads - emptied trash - ran disk utility - ran disk utility from boot disk - updated OS - checked Activity Monitor - no unfamiliar apps running - disabled all Thunderbird extensions - disabled Thunderbird shockwave Flash Help please! thanks, Sandy

Modified by ineedacoffee

All Replies (4)

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I'm afraid not. Thanks, though.

There is another thing that started with the trouble. When I open up Thunderbird I get a blank screen (I uploaded a screenshot), followed by a brief flash of black around the outside of the application. The flash of black happens too fast to get a shot of.

thanks, Sandy

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Does it happen only in full screen?

https://bugzilla.mozilla.org/show_bug.cgi?id=1403085

Or dual monitor?

Or 4k screen?

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Wayne, thanks for sticking with this. I really appreciate your help!

I am on a MacBook Pro (Retina, 15-inch, Mid 2014), just the one screen. The problem comes up whether Thunderbird fills the window or is shrunk down.