Long delays or stalls when refreshing terminals with lots of static text over a slow link

There are sometimes excessively long refresh delays with a slow link and a terminal with lots of unchanging text. When switching between tmux windows with lots of static text on a 475x125 character console, it can take many seconds to hours to refresh the terminal. Sometimes it completely stalls with the terminal partially refreshed, and while refreshing it saturates the server-to-client connection. Neither the client nor server are taking excessive CPU. The client indicates a lost connection, but if I type a hot key on the client to switch tmux at the far end to a sparsely populated window, the whole thing recovers. It fails again as soon as tmux is switched to a window with lots of text.
An ssh connection at the same time to the same tmux window refreshes in a couple of seconds.

Start by reproducing the refresh using a slow link, a 475x125 terminal, and tmux windows with lots of static text; compare it with the reported SSH behavior. Trace the refresh path and connection traffic while switching windows. Done means the populated window refreshes reliably without stalling, falsely reporting a lost connection, or saturating the server-to-client link.