why is "Google Hosted Libraries" using gzip compression level 5?

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Hans Henrik Bergan

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May 9, 2020, 8:23:23 AM 5/9/20

to Google AJAX APIs

these libraries only needs to be compressed once, after that they can be served pre-compressed thousands, or even millions of times, right?

so i would imagine they'd use gzip -9 to minimize bandwidth usage, and make the library load as fast as possible, but testing on
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js

it seems that file is served with gzip compression level 5... why? that would make sense if they're compressing the file on-the-fly for every request and they're trying to minimize cpu-utilization, but storing it pre-compressed would use way less cpu anyway, so that probably isn't it.. why is it served using gzip -5?

Philipp Wollermann

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May 12, 2020, 10:35:37 AM 5/12/20

to Google AJAX APIs

Hi,

good question. I'll try to find out and will get back to you here, but I won't have time for it before next Monday. I've put this on snooze so I don't forget - but if I do, please feel free to ping me again here!

Cheers,

Philipp

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