As the amount of COVID-19 data grows, the 91-DIVOC has more and more points to render and mouseovers for you to highlight to dive deeper into the data. This past weekend I added the ability for the site to “know” which graph(s) are on your screen and only keep those graphs in memory. From my testing, it appears it have made the option selection more responsive and the initial page load faster. :)
Additionally, the x-axis now uses a date scale and looks significantly better on mobile (where, previously, the axis labels started to fall on top of themselves).