Half-compiled, slow gnus-cus.elc

[Hallvard B Furuseth <h.b.furuseth@usit.uio.no>]

gnus-cus.el uses backquote in (calculate ...) forms, which are not
compiled.  Backquote is pretty slow; it must first compute the form to
be executed and then execute it.

Possible fixes:

In custom.el, define a byte-optimizer for custom-declare:
  (eval-and-compile
    (put 'custom-declare 'byte-optimizer
         '(function which parses the custom form and
           byte-compiles the (calcuate ...) part    )))
I don't know how hard that would be, I don't know the exact syntax of a
custom-declare form.

Or, in gnus-cus.el, use something like this:
  (eval-when-compile (require 'bytecomp))
  (custom-declare
    `(... ,(cons 'calculate
               	 (byte-compile-sexp '(form to be calcuated)))))

Or simply don't use backquote.

It might also be an idea to push for modifying bytecomp somewhat: Define
(quote-form ...) which quotes a form to be compiled, similar to
(function ...) which quotes a function to be compiled.  Then the code
above wouldn't have to refer to bytecomp:

  (custom-declare
    `(... ,(cons 'calculate
               	 (quote-form (form to be calcuated)))))


Regards,

Hallvard