Re: animate incredibly slow compared to 21.3

[Miles Bader]

On Sun, 13 Mar 2005 02:15:22 +0100, Kim F. Storm <address@hidden> wrote:
> I still fail to see why sit-for is so bad in line-move -- most of the
> time it simply means that redisplay happens a little sooner than it
> would otherwise do.

Because `sit-for' means something completely different -- it means
"Hey I want the user to see this, please flush any pending redisplay
so he can see it" [modulo details about about buffer input etc.]. 
What you're talking about is "hey, let me calculate some stuff more
accurately."

It's quite reasonable to want to do the latter in code that shouldn't
be displaying anything.  Conflating the two notions is ugly and
pointless.  _Even if_ the current most practical workaround for some
problem is to use `sit-for' when you really want to do the other
thing, it would make a lot of sense to at least call it something
else, and have that something else use sit-for.

If I do something requiring up-to-date display calculations, and then
record it in a keyboard macro and execute it with a repeat-count of
10,000, I certainly don't want to see it redisplay 10,000 times -- I
want it to sit there silently until it's done, and then redisplay.

-Miles
-- 
Do not taunt Happy Fun Ball.