[wldlyinaccurate]

The web is getting faster, yes. This manifests as a constant (albeit slow) downward trend in global aggregate metrics. We think this trend is mostly due to Google pushing performance metrics being linked to search rankings.

However the data presented in this post shows obvious step changes in performance that correlate with browser version rollout. It would be disingenuous not to attribute this to a concerted effort on performance improvements from the Firefox team.