> The last time I can remember being disturbed by XEmacs'
> sometime in the mid 90s when I was running Lucid Emacs 19 on a
In VM, I run into serious slowness every day; I'd like to just keep
all my VM folders as single files, but it's just not reasonable once
you get past about 20MB.
True. I'd forgotten that. I used to have speed problems with VM, but
then I slightly modified my practices to keep folders below a
reasonable size (10-20MB), and the only time I notice is on the rare
occasions when I try to load the last 20 years' mail in one file
(which I don't do, since it doesn't work!).
I notice that if I do that (130MB folder, 30k messages), 21.4 and 21.5
have very different behaviour (with the same vm code).
21.4 loads the file quickly, and in some not too bad time enters
vm-mode. By then, it's using 180MB of main memory.
21.5 is slower to load, and is then a good deal slower to go into
vm-mode, after which time it's using 450MB.
But the most striking difference is generating the summary:
21.4 basically can't do it - on the basis of how it starts, it would
take weeks to finish.
21.5, on the other hand, generates the summary in reasonable time.
So it looks as if the difference is some quadratic vs linear
difference of the kind you mention. Would you have an idea what the
key difference between 21.4 and 21.5 would be, that removes the
terminal slowness of summary building?
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