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Slow images in NT/W2k/XP

I have an app which loads a proprietry file containing a large number of jpeg images and displays them. The images are decompressed and displayed in standard TImages.
If I run the app under W95/W98 etc I can display up to about 40 images/sec. If I run it under NT/W2k/XP it slows to about 2 or 3 images/sec. This happens on many different machines including some with very fast processors and high power graphics cards. You can see the images repainting on the screen - it's horrible.
The original app was written in Delphi3. I have just converted it to D6 and compiled it on a W2k machine and it is still exactly the same.
Is there some trick and/or setting to make, either to the OS or to the app or component, to make Timages work faster with NT etc?

This is really bugging me - 200 points to the winner.

Regards, John

ginsonic

listening

SteveWaite

Sounds like too many events setting off.
How are you painting?

Regards,
Steve

jellison

ASKER

I first decompress the jpeg into a hidden image. Then I check the jpeg comment data embedded in it before copying it to a visible image by doing

ImageN.Picture := HiddenImage.Picture;

Regards, John

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SteveWaite

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jellison

ASKER

Just tidying up. Haven't solved it yet but I will post another question in a different way.

SteveWaite

Thanks! only wish I could help further. I will keep an ey out for the next q.