I had a problem where the display slowed down, to the point that the display might be about two songs behind the music that was actually playing. Problems of this nature don't seem related to wireless signal strength or anything like that, as the trasfer of music is not affected.
Perhaps yours is like my problem - an issue of the CPU of your server being overburdened.
Check how much of your CPU capacity is being used while the display is slowing down. If there are a lot of processing resources being used, then your display may well slow down a lot. While my processor is pretty speedy, and I had no other applications running when my display slowed, I was making use of the Inguz room correction plug-in for the squeezebox - and it was an old manifestation that used processing capacity pretty intensively. If something like this is slowing you down, look for processes that you can terminate.
Chad