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The release dashboard is big, about 12 MB of raw HTML.
The template is heavily indented, which is very good for readability.
But this results in over half the generated page being whitespace.
If we strip indentation, this gets us down to around 5.4 MB, making it around 55% smaller.
Stripping the leading indent from the generated page should reduce the page load time from around 7s to 4s.
I've also opened a PR to enable gzip compression on the nginx server (python/psf-salt#655), which should do a very good job of compressing repeated whitespace, so this PR won't have as big as an effect, maybe half a second or so.
But there's still a benefit: half the data to send from Twisted to nginx and compress, half to keep in the browser cache, and a bit less parsing in the browser.
Easy to disable for local dev/testing of the dashboard if needing to inspect actual HTML.