Greg.... first of all, 9.1 on all three of my systems virtually solved the "GUI" issues... not completely, but mostly-say 99%... Now, they did appear moire frequently with 9.2... having said that: there are a couple of things with 9.2 that may be causing it. but at least try to get 9.1 installed if possible.
Do a cold restart (remove power) ... after boots up, 1PPS etc... see if can install FW 9.1. Make sure get verified from server.
Now, the memory available on Discovery Board is about exhausted, which is why JQuery etc is loading from web, rather than local... we need to get everybody to newest Firmware, so try to go and stay at 9.1 of possible 9.2 is next stage to process more impulse / controller data parameters... and there are a couple of 'errors' in the 9.2 GUI display currently, ... no controller guide, couple of missing / incorrect links. Also we are probably serving to an LMO IBOD server, not a BT server, at least for a short time...
There are some functions, parameter options, etc, which are 'now included' but not operational as yet, that may also be part of the slow, or incomplete GUI, ... probably 9.2 should have been "BETA", but I think they're rushing to check some of the new implementation and processing prior to next step...
The ASs3935 may be part of the 'memory' problem local... note that support for AS3935 is basically non-exsistent, was deprecated and removed from blue, and I suspect that will be eventually removed from the RED FW, in order to use the Discovery's resources purely for BT. I've Joe's old 791 with AS3935 installed, and removing it eased the GUI issue with the older firmware, for the most part...
Now, I had upgraded RED 689 to 9.2 had a few GUI issues initially, and periodically... but that may be due to the system calling for those 'missing parts' mentioned above... had no problem reverting 689 back to 9.1.
It took complete browser cache cleaning and several 'refreshes' to have 9.2 completely 'settle in', also, for some reason, I have more 'consistent' display all three systems coming in from WAN rather than LAN.. go figure.... Default MTU is 1480, and I raised mine to 1500 couple of years ago, which appeared to ease the GUI issues on the older firmware... haven't reverted to 1480 but I might try that.
System BLUE 1439 has similar 'missing' page info, etc as above, but seems satisfactory at the moment, again took browser cache cleaning and a few refreshes to 'settle in'...
OH... also turn off LCD Display... heh..