Gerrit is a browser memory hog and/or makes my browser hang when "Diff all side-by-side" of https://gerrit.wikimedia.org/r/#change,4631. Seems to be caused by tests/messageindexdata.ser. I think Gerrit probably shouldn't just open these kind of files.
FF11 used 1.2GB when done after a few minutes.
Steps to reproduce:
I. Observed, Chromium 44.0.2403.157: CPU usage 100 % and RAM usage increases indefinitely; the "unresponding window" turns up and by terminating it the second time RAM usage is limited to 600 MB.
II. Observed, Firefox 39.0: CPU usage is 100 % indefinitely, browser freezes entirely; RAM usage increases for a bit (200 MB?) and then goes down. The browser has to be terminated by the OS.