Emacs client scalability for long, deeply-nested threads

[Jed Brown]

I occasionally end up with threads containing several hundred messages
and deep nesting.  Eventually, displaying them exceeds the default
max-specpdl-size and later max-lisp-eval-depth.  These variables can be
increased, but the time required to display the thread stretches to
minutes.  Does anyone have suggestions for improving performance in such
scenarios?
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