I posted this in the New England thread, but let me show an example of what I'm talking about above...
https://emmy7.casa.umass.edu/umaxx/nexrad.html
This is just BOX and ENX data and granted I am not generating large composites or all the dual pol products, but from a pure browser speed perspective, note the difference between generating/overlaying full PPIs vs tiling on the weather service page. You don't have to have 'map move' event listeners, nor handle tons of tiling queries.