Following up my own comment...looks like current Gmail will have trouble. Loaded in chrome with mobile set to "Pixel 2", and there's one js file that not only blows the per-script max size, but blows the whole "Total Script Budget" by itself, not including the other 78 js files gmail wants to download. Stopped looking there.

(Per-script max size: 50KiB, Total script budget: 500KiB)