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Thanks, we're looking into how to fix the perf in FF. Meanwhile, it works on my tiny mobile cell phone.


Disabling the box shadow on .content-root fixes the performance bug (FF46.0).


Thanks for finding that out. We (Firefox) fixed a box shadow performance bug [1] in Firefox 47, which will be released on June 7th. It looks like this site is hitting that perf bug.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1250947


We just discovered the same by disabling the media query which handles the shadow. Thank you very much for investigating.


Seems to work fine on FF (46) now, thanks.


I can confirm the same laggy behavior in FF 46. But, strangely, it works completely fine on FF 48 (dev edition) :S




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