I see ping times consistently around 10ms on my WiFi connection. However, it sometimes briefly spikes upward (while remaining green). Based on the behavior of the line, I think this might be happening when the bit of JavaScript drawing the line on the canvas staggers, rather than a blip in the connection itself. Probably a bug? It's quite noticeable when resizing the window, for example.

(I don't think it's the connection being flaky. Running `ping gstatic.com` in the terminal at the same time as the webpage is in the foreground shows a maximum time of 23ms after 180 pings.)