Emilio, spikes here seem to be from bug 1528613 https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=228570762&searchStr=linux%2Cx64%2Cpgo%2Cmochitests%2Cwith%2Ce10s%2Ctest-linux64-pgo%2Fopt-mochitest-browser-chrome-e10s-4%2Cm-e10s%28bc4%29&tochange=683836b692db76292cc3e4494256578afe69f24e&fromchange=6c289d94dcca88ecfe3893633a31370119c061c7 can you take a look?
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Emilio, spikes here seem to be from bug 1528098 https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=228570762&searchStr=linux%2Cx64%2Cpgo%2Cmochitests%2Cwith%2Ce10s%2Ctest-linux64-pgo%2Fopt-mochitest-browser-chrome-e10s-4%2Cm-e10s%28bc4%29&tochange=683836b692db76292cc3e4494256578afe69f24e&fromchange=6c289d94dcca88ecfe3893633a31370119c061c7 can you take a look?