FINAL FOLLOWUP:
Well, this was interesting to me. Rebooted my ASUS RT-AC66U router. Probably been several months or close to a year since done anyway. Now the mis-behaving eHam.com is loading as quick as everything else was.
Not sure if something changed in the router, or the re-boot caused something to change in the ISP's equipment.... ( a 5 GHz dish on the roof )... but all is well.