1679324 - 78.5.0 periodically hangs up with very high CPU utilization for 10 - 20 seconds

Status: RESOLVED INCOMPLETE

(Thunderbird :: Mail Window Front End, defect)

Description

[bob_gilman]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

Don't know how to reproduce - it just seems to happen periodically.

Actual results:

When working in some other window, I go to compose an email or check for an email, and I find I cannot select a different email, nor can I move the slider on the currently-selected email - Thunderbird appears locked up and Task Manager indicates very high CPU usage. The problem clears after 10-20 seconds.

Expected results:

Thunderbird should have responded right away.

Comment 1

[bob_gilman]

This just happened while I was reading email. The CPU utilization ran around 33% for about 45 seconds, then fell and Thunderbird responded normally.

Comment 2

[Wayne Mery (:wsmwk)]

The two most likely possibilities

• specific to version 78 - hardware acceleration: options > type in "accel" > uncheck use hardware acceleration > restart
• for any thunderbird update - antivirus software: test by starting Windows in safe mode

Comment 3

[bob_gilman]

I still see the problem after unchecking "hardware acceleration" in the options. I've tried running an antivirus scan (MalwareBytes), then trying to get messages: that seemed to block Thunderbird, but when I tried it again, it did not. I did note that I was able to refresh a webpage quickly while Thunderbird was unresponsive and running at ~33% CPU utilization. It doesn't appear that internet access is running slow.

Comment 4

[Wayne Mery (:wsmwk)]

Did you try windows started in safe mode?