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emacs -Q(no init file). Say, at each step, what you see and what you expected to see instead. A true hang is most likely an Emacs bug, in which case you should useM-x report-emacs-bug.global-so-long-modeaddresses a sub-set of these kinds of problem (by turning various slow things off); but it doesn't automatically trigger in the 'dynamic insertion' situations you've mentioned (shell output) and, ultimately, extremely long lines will present problems for the Emacs redisplay code even if no other features are slowing things down (on account of the trade-offs inherent in various other features of the text rendering in Emacs). Nevertheless,so-long.elwill likely still be of interest to you.