Hi Philip,

I had researched these three calls with the "require 'info", and
updated the patch for better performance.
The 1 th and 3rd can be rewritten with the new form, but the 2nd one
is necessary, and should not be changed.
Please help review the new attached patch file. Thanks.

Hi Eli,
> And this is the only place in Emacs where we have (require 'FOO) and
> FOO is not necessary for Emacs to start up?
My configuration will load the package.el at startup, so I tracked the
initial packages, and found the "require `info" will take ~1 seconds
on my old PC.
I didn't pay attention to other packages, if I found a heavy one, I'll
post it on the mail list.