Re: Very slow GraphicsImportDraw on MacOS 9.1

• Subject: Re: Very slow GraphicsImportDraw on MacOS 9.1
• From: patrice krysztofiak <email@hidden>
• Date: Fri, 21 Sep 2001 19:23:28 -0400

I have found that my JPEG drawing code is extremely slow and after much research I have found that the slow down began with MacOS 9.1.

I wrote a very simple (about 120 lines of code) application that loads a JPEG and draws it 100 times. On the same machine (iMac 266MHz) I ran my test running MacOS 9.0.4, and it takes 266 ticks to call GraphicsImportDraw 100 times. If I ran my test with macOS 9.1 it takes 733 ticks.

On my PB G4, running the same application it takes 775 ticks if I draw to an offscreen GWorld. If I change the application to draw directly on the screen it only takes 166 ticks to draw the JPEG 100 times.

If I change any parameters to the graphics importer, like the BoundsRect or DestRect then it will take 755 ticks to draw onto the main window, which is visible and on screen.

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