For some reason, PageLoad/svg/files/bamboo_01.svg has a really high variance on Chromium: http://webkit-perf.appspot.com/graph.html#tests=[[1476601,2001,3001],[1476601,2001,7288486],[1476601,2001,32196]]&sel=1347418097119,1348022897119&displayrange=7&datatype=running I can also reproduce the same behavior locally. Not sure what's causing it but I'm pretty certain it's not a test flake. It doesn't have such a high variance on other ports.