The patch improved glterrain, but perf_reftest becamse a bit worse. https://treeherder.mozilla.org/perf.html#/compare?originalProject=try&originalRevision=41a03c8da94934fc9e40b25e2c4ad9af98590bfb&newProject=try&newRevision=0c07df6f397926961b0bde1fd3f91dc25b72978f
Bug 1531898 Comment 13 Edit History
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Attachment 9070899 [details] does not have necessary change around WebRenderBridgeParent::RecvEmptyTransaction()