Slow internet data load issues

[patudom]

If you throttle your internet speed using the browser dev tools, there are several issues that crop up. For example, you can press "play" and the slider will step through all its time steps without a TEMPO map image ever appearing. If an image for a day has loaded, that image continues to display when you change dates even though that is not the correct image for the new date.

This list is meant to address those issues:

• Slider/"play" should be disabled until the data for a day have loaded. (Or maybe if we are adding tickmarks to the slider, each tickmark on the slider can be enabled as that image is loaded).
• When the user chooses a new date, the images from the previous date should be removed from the map
• This is not specifically related to the data load, but we should check that all pieces that need to load onto the page are as small as possible (including things like logos).