Have been playing H&H (this time) since last August with no problem.
This weekend a friend used my computer briefly and turned off Network Discovery, saying it was only used for local networks, not internet. Later I went online via Brave browser (he used IE) and all my extensions crashed, I turned on Network Discovery and all but one worked again; eventually had to update browser and reinstall that extension. Now everything I do online has a slight lag, not horrible but noticeable since i'm quite accustomed to this system. I have done Network Troubleshooting, checked all drivers, checked connection speed, done malware scan with three different programs, reinstalled Java (and removed old version). Everything online still noticeably, though slightly, slow (except Elvenar, which now crashes during loading - "Aw Snap, error: out of memory").
How does this pertain to H&H? Frame rates, if you can call them that, are now about one frame every 2-3 seconds; watch the flags over visitor gate, they move once every few seconds, click on ground for character to walk and it will be 10-15 seconds before they move, and they walk at the same rate; type an entire sentence in chat and hit enter before half the text has even appeared in chat window. Everything works in the game but now at this exceedingly slow rate, it would take 30 minutes to do what is normally done in five. I feel this is tied to Network Discovery being turned off and back on and something not being reset properly, and/or some issue with Java; but I've exhausted my limited knowledge of these areas.
FWIW, there is no local network, nor WiFi; system is connected via cable to modem/router. Problem only affects online activity, other programs/games are fine.