Emacs client scalability for long, deeply-nested threads

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+From: Jed Brown <jed@59A2.org>\r
+To: notmuch <notmuch@notmuchmail.org>\r
+Subject: Emacs client scalability for long, deeply-nested threads\r
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+Date: Mon, 23 Mar 2015 12:09:08 -0600\r
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+I occasionally end up with threads containing several hundred messages\r
+and deep nesting.  Eventually, displaying them exceeds the default\r
+max-specpdl-size and later max-lisp-eval-depth.  These variables can be\r
+increased, but the time required to display the thread stretches to\r
+minutes.  Does anyone have suggestions for improving performance in such\r
+scenarios?\r
+\r
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