Is there a fixed leader board ?

I don't look at the live speed and accuracy stats while I'm typing anyway. Disabling those updates could also improve the latency of the highlighting updates.

Why I type fast, I notice the highlighting has trouble keeping up, which makes it easier to lose my place.

Performance analysis shows a fair amount of time is spent in calls within jQuery and React.

I wonder how much more performant the site would be if raw JavaScript was used to update the UI during typing without using React or jQuery.

Thumbs up on the design refresh.