on a buffer performance test on Windows GNU EMACS 28, 27, 26 and 24

[Wayne Harris]

On Windows, I said M-x run-python, then said

  for i in range(100000): print(i)

on both GNU EMACS 28, 27, 26 and GNU EMACS 24.  It turns out GNU EMACS
24 is the slowest.  There doesn't seem to be a difference between 28 and
27, but 26 is clearly slower too.

I timed the speed of the buffer to scroll up.  I used my own phone's
stop watch.  I started out the slow one first, which was EMACS 24, only
after it was running I started the clock, then I started GNU EMACS 28's
code.  The result was GNU EMACS 28 finishes in less than 8.00 seconds.
GNU EMACS 24 finishes after 24.44 seconds.  I didn't time 27 and 26, but
I couldn't tell any difference between 28 and 27.  And 26 was slower
than 27 and 28.

What is the reason for the difference?  Thanks!

GNU Emacs 24.3.1 (i386-mingw-nt6.2.9200) of 2013-03-17 on MARVIN
GNU Emacs 26.3 (build 1, x86_64-w64-mingw32) of 2019-08-29
GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-08-21
GNU Emacs 28.0.50 (build 1, i686-w64-mingw32) of 2020-07-05