[SDL] SDL slower in fullscreen mode

David Olsen jolynsbass at hotmail.com
Sun Jan 16 11:05:38 PST 2005

Are you using SDL_DisplayFormat() to ensure that your surfaces will blit as
fast as possible? Also, check that you really are getting a 32-bit surface,
and that everything is not being converted "on-the-fly", with every
blit(Though, SDL_DisplayFormat should keep that from happening, regardless
of actual bit-depth.)
Another thing to check is: Are you using SDL_Delay() with values of less
than 10? For some reason, one application I wrote behaved very erratically
and slowly if I used anything less than 10ms as a delay. Some CPU's don't
respond well to that I guess. Just an idea.

----- Original Message ----- 
From: "Colin Vella" <colinvella at waldonet.net.mt>
To: <sdl at libsdl.org>
Sent: Sunday, January 16, 2005 5:57 AM
Subject: [SDL] SDL slower in fullscreen mode

> Hi,
> I am experiencing a problem running my 640x480 32bit screen application
> (win32). It runs at a reasonable speed in windowed mode but slows down
> drastically in fullscren mode. Has anyone experienced the same problem and
> perhaps shed some light as to the likely cause? (My desktop is set at
> 1024x768 32bit)
> Thanks,
> Colin
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