User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0 Build ID: 20170409123541 Steps to reproduce: Go to starcraft.com. The top of the web page takes long to render. This is especially apparent, when you switch to another tab and back. Actual results: A few seconds of rendering. The profiler shows, that nearly all of the time is spent in nsCSSRendering::PaintGradient
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