Bug 1107251 Comment 38 Edit History

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Sorry for my late reply, I did not notice your request for info until now.

Yes, I am able to reproduce needlessly high CPU load on hanging connections also with a current Firefox (version 112),
by setting up proxy 1.2.3.4 as stated in my OP above, which meanwhile is 8.5 years back.
With Firefox meanwhile "only" 15% of a CPU core gets wasted on my current Linux machine,
apparently due to some silly busy waiting.

With current Thunderbird the wast is even about 60% - see also bug 1830641

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