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From: Dan Nicolaescu <dann@gnu.org>
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Subject: Re: byte-compiling files loaded in loadup.el
Date: Fri, 06 Aug 2010 14:21:15 -0400
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> A little experiment shows that byte compiling any of the files in
>> loadup.el that are currently not byte compiled (and not explicitly
>> excluded by loading the .el version) the pure size grows a little bit.
>
>> This means that there are a few extra objects that do not need to be
>> garbage collected every single time the garbage collector runs.
>
> Maybe it means instead that the byte-compiled versions use up
> more space.

It might.
IMO we should still byte compile them, even if it's just for compile time error checking...