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Opening JPEG images in Preview is slow as molasses

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It's totally unusable when flipping through many images.

 

Operating system: OS 10.6.5 - completely up-to-date. Clean install onto formatted HD.

Preview.app version 5.0.1

 

Hardware:

Model Identifier: MacBookPro1,1

Processor Name: Intel Core Duo

Processor Speed: 2.16 GHz

Memory: 2 GB

Boot ROM Version: MBP11.0055.B08

SMC Version (system): 1.2f10

 

Chipset Model: ATY,RadeonX1600

VRAM (Total): 256 MB

EFI Driver Version: 01.00.068

 

Other image formats work fine. Other apps open JPEGs instantly.

I had Tiger before, and JPEGs would load instantly.

My hard drive is healthy. Console doesn't show any unusual messages.

 

I tried turning QuartzGL on and off, system wide with the terminal command

sudo defaults write /Library/Preferences/com.apple.windowserver QuartzGLEnabled -boolean YES

I tried creating a new user account.

I tried copying Preview.app from the install DVD.

 

Here is a screen capture I made of the problem: http://www.youtube.com/watch?v=ylpCi7KtT3s

 

Here is a screen capture someone else did: http://dl.dropbox.com/u/5803292/previewspeedtest.mp4

Here is him performing the same task with the same hardware in OS10.4: http://dl.dropbox.com/u/5803292/tigerpreview.mp4

 

I get mostly ignored on Apple.com discussion forums.

Kinda disappointed and frustrated here.

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