Honestly, I have an ~110Mb cable connection (From a fast CDN I can acheive downloads in excess of 13MB/sec) and new Google Maps is still a dumpster fire that is inferior to old Google Maps in every way I can imagine.
Ditto and I have a gigabit connection. Slooooow. I just profiled the maps start page and it transferred 2.5MB in 182 requests and took 2.56s to load. This compared to 544ms for the Google homepage. It's like their optimization team never got invited to Google Maps.