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ATS9: performance regression #6178

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@shinrich

Just synced our internal test branch with the open source 9.0.x branch. When I installed the resulting package on our canary production box, the average response latency more than doubled from around 120ms to over 450ms.

Running my python analysis script over squid.log files with the previous build and the new build show that the change is in HTTP/2 transactions.

Previous build H2 stats

total 1203448 entrys 50%=27 80%=146 90%=304 95%=464 99%=1054 max=%858135

New build H2 stats

total 561087 entrys 50%=26 80%=193 90%=417 95%=1670 99%=9980 max=%857883

If I revert @masaori335's commit 2baa388, then the average latency goes back down.

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