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(gnus)Compilation

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Compilation
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   Remember all those line format specification variables?
`gnus-summary-line-format', `gnus-group-line-format', and so on.  Now,
Gnus will of course heed whatever these variables are, but,
unfortunately, changing them will mean a quite significant slow-down.
(The default values of these variables have byte-compiled functions
associated with them, while the user-generated versions do not, of
course.)

   To help with this, you can run `M-x gnus-compile' after you've
fiddled around with the variables and feel that you're (kind of)
satisfied.  This will result in the new specs being byte-compiled, and
you'll get top speed again.  Gnus will save these compiled specs in the
`.newsrc.eld' file.  (User-defined functions aren't compiled by this
function, though--you should compile them yourself by sticking them
into the `.gnus.el' file and byte-compiling that file.)