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Very slow rendering of large build logs in Chromium

Using GitLab 8.6, I have a build log with ~1.8MB in ~18000 lines.

Chromium takes 42s to render the page, spent mostly in two layout passes a 20s:

Screenshot_2016-03-24_11-37-59

(Tested on Xubuntu 15.10, using Chromium 49)