# SLowdown on ATI

**URL:** <https://discourse.glfw.org/t/slowdown-on-ati/139>\
**Category:** support\
**Created:** [September 2, 2004, 7:14pm UTC](https://discourse.glfw.org/t/slowdown-on-ati/139 "2004-09-02T19:14:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![system](https://canada1.discourse-cdn.com/flex035/uploads/glfw/original/1X/b8cdefe6b61b8d5aee6c43b2c56e9cf5eabecfe4.svg) [@system](https://discourse.glfw.org/u/system)\
**Post date:** [September 2, 2004, 7:14pm UTC](https://discourse.glfw.org/t/slowdown-on-ati/139/1 "2004-09-02T19:14:08Z")

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**[kohaistyle](https://sourceforge.net/u/kohaistyle/)** wrote on [Thursday, September 02, 2004](https://sourceforge.net/p/glfw/discussion/247562/thread/b700e717/#1d0c):

Hi peeps !!

Just to check if other GLFW users are suffering of the same disease …  
The GFLW rendering is horribly slow, when launching the app in fullscreen, while it works ok in windowed mode …  
On a side note, it also looks like the multiple monitor feature is causing a real pain to GLFW apps, either with Nvidia or ATI cards ( easily fixed by disabling dual view ).

DO you think you can fix this ATI misbehaviour, or do you have any hints ???

Thx a lot, and congratulations for the work already done …  
Really waiting for the next release !

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**Author:** ![system](https://canada1.discourse-cdn.com/flex035/uploads/glfw/original/1X/b8cdefe6b61b8d5aee6c43b2c56e9cf5eabecfe4.svg) [@system](https://discourse.glfw.org/u/system)\
**Post date:** [September 4, 2004, 12:23am UTC](https://discourse.glfw.org/t/slowdown-on-ati/139/2 "2004-09-04T00:23:02Z")

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**[kohaistyle](https://sourceforge.net/u/kohaistyle/)** wrote on [Saturday, September 04, 2004](https://sourceforge.net/p/glfw/discussion/247562/thread/b700e717/#1d0c/bf1d):

Allright ! on the same complaining tone ( please bear : i’m not complaining, just asking ! ^^ ), has GLFW some&nbsp; z-buffer issues ???

Because when i’m compiling an app with GLFW, i have some Z-buffer artefacts, while the GLUT version displays the mesh just fine … ( with the exact same source code, apart from the glut/glfw calls )

Is this a known fact ?

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**Author:** ![system](https://canada1.discourse-cdn.com/flex035/uploads/glfw/original/1X/b8cdefe6b61b8d5aee6c43b2c56e9cf5eabecfe4.svg) [@system](https://discourse.glfw.org/u/system)\
**Post date:** [September 6, 2004, 3:40am UTC](https://discourse.glfw.org/t/slowdown-on-ati/139/3 "2004-09-06T03:40:44Z")

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**nobody** wrote on [Monday, September 06, 2004](https://sourceforge.net/p/glfw/discussion/247562/thread/b700e717/#1d0c/a9fe):

Yes, I just down loaded glfw to try it.&nbsp; The particles demo runs about 1.9 fps when fullscreen on my P4 2.2 Ghz with Radon 9800.&nbsp; I recomplied it to run in windowed mode and it runs 574 fps.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex035/uploads/glfw/original/1X/b8cdefe6b61b8d5aee6c43b2c56e9cf5eabecfe4.svg) [@system](https://discourse.glfw.org/u/system)\
**Post date:** [September 6, 2004, 3:53am UTC](https://discourse.glfw.org/t/slowdown-on-ati/139/4 "2004-09-06T03:53:01Z")

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**nobody** wrote on [Monday, September 06, 2004](https://sourceforge.net/p/glfw/discussion/247562/thread/b700e717/#1d0c/a9fe/f930):

Definately has to do with multi-monitor mode.&nbsp; When I disable the multi monitor mode the demo runs fast in fullscreen.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex035/uploads/glfw/original/1X/b8cdefe6b61b8d5aee6c43b2c56e9cf5eabecfe4.svg) [@system](https://discourse.glfw.org/u/system)\
**Post date:** [September 17, 2004, 7:31am UTC](https://discourse.glfw.org/t/slowdown-on-ati/139/5 "2004-09-17T07:31:41Z")

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**[marcus256](https://sourceforge.net/u/marcus256/)** wrote on [Friday, September 17, 2004](https://sourceforge.net/p/glfw/discussion/247562/thread/b700e717/#1d0c/a9fe/f930/09d4):

Multimonitor support is something that I am looking into. It almost made it into 2.5 (not yet released), but will probably be in 2.6.