It seems like the first paint for desktop in the p95 and p99 has increased two times in ca 2016-10-14 and 2016-10-25

https://grafana.wikimedia.org/dashboard/db/navigation-timing-by-platform?panelId=26&fullscreen&from=now-30d&to=now&var-metric=firstPaint&var-platform=desktop&var-users=anonymous

It's not the same on mobile, it's desktop only. Lets check if this is because of a change we did or something in how we collect metrics.