I've been testing out https://github.com/devtools-html/har-export-trigger it seems it add extra noice to our metrics, I'll create an upstream bug when I have more metrics:
https://sv.wikipedia.org/wiki/Stockholm
With HAR turned on (11 runs):
FirstVisualChange:{"median":2266,"mean":2230,"mdev":80.3394,"min":1800,"p10":1866,"p90":2566,"p99":2700,"max":2700}Without:
FirstVisualChange:{"median":1733,"mean":1633,"mdev":43.7079,"min":1300,"p10":1466,"p90":1733,"p99":1733,"max":1733},And comparing with Chrome:
FirstVisualChange:{"median":1000,"mean":1021,"mdev":24.3429,"min":900,"p10":933,"p90":1133,"p99":1133,"max":1133}So it makes Firefox slower (that is ok) but also adds extra variance (we don't want that).
