The result is an js memory leak, but the process is not growing linearly. What is the reason?

run a script that makes the web page in the browser run a piece of logic repeatedly. The js heap will reach 600MB in an hour and a half, but only 30MB in an hour. In my opinion, this memory leak is a non-linear growth. What is the problem? Bug? of chrome It uses version 49 of chrome

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by the way, take a look at
https://bugs.chromium.org/p/c.
for translation, huh?

Mar.23,2021
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