Toggl Track website high CPU usage on Overview page

When on the Overview page of the Toggle Track website app, CPU usage spikes, sending the fans on my MacBook Pros into overdrive. This only happens when on the Overview page. All other pages use nominal resources.

After loading data and rendering the graphs, I cannot imagine what the Overview page is doing to cause such high CPU usage. Perhaps some code is caught in an endless loop?

This happens with both Firefox and Safari on both of my MacBook Pros; One Intel, the other, Apple Silicon.

Kevin