Why is OSX with rotated display slow on Mini?

kraftzwerg

macrumors regular
Original poster
Jul 8, 2005
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I like to use the rotate display option in "Display preferences" under Tiger (comes in handy to display whole pages while keeping them readable on a 17 inch screen). However, once I turn on this setting, OSX becomes suddenly terribly slow, e.g. when I move a window the movement lags behind the cursor and is very choppy etc.

My question: is this an issue that's specific to the Mac Mini ? Is it a harware or a software problem? [Maybe the graphics card is somehow optimized for landscape mode and can't handle portrait mode?] Is there something one can do to fix this?

Thanks for any hints!
 

Veldek

macrumors 68000
Mar 29, 2003
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Though I also think that this is a limitation of the graphics card, I would expect Mac OS X to not show this preference unless it could handle it.
 

kraftzwerg

macrumors regular
Original poster
Jul 8, 2005
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I am surprised though that OSX should need CoreImage for this effect. One would think that it merely needs to exchange the x- and y- coordinates of its display coordinate system, which doesn't sound like it should require a lot of processing power.
 

MacsRgr8

macrumors 604
Sep 8, 2002
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kraftzwerg said:
I am surprised though that OSX should need CoreImage for this effect. One would think that it merely needs to exchange the x- and y- coordinates of its display coordinate system, which doesn't sound like it should require a lot of processing power.
I don't think it needs Core Image.
You could enable this feature in Panther aswell, using the ATi Radeon Utilities.

Install the ATi Display Utilities . It will install drivers, and add a System Pref.
Maybe that will help.
 

kraftzwerg

macrumors regular
Original poster
Jul 8, 2005
120
0
MacsRgr8 said:
I don't think it needs Core Image.
You could enable this feature in Panther aswell, using the ATi Radeon Utilities.

Install the ATi Display Utilities . It will install drivers, and add a System Pref.
Maybe that will help.
That was an interesting hint - thanks! I did install the ATI utilities and it did indeed offer another way to rotate the screen. Unfortunately it doesn't seem much quicker than the feature built into Tiger.