well rect isn't copyrect. rect is a 2d primitive command. tho it's fairly fast, but probably this depends on the graphics card. But I would rather say it has something to do with the bus speed.
Writepixelfast's speed depends on the bus performence a lot. I would suggest to make a test app that is checking the speed of writepixelfast and readpixelfast only and ask your friend to run it. To make things easy, the app may write the results to a text file, so your friend can mail it to you.
Especially when you writepixelfast to an image that is located in the VRam, this may be pretty slow because the system has to "take the bus" and no matter how fast the cpu or 3d chip is, if there's rush hour, it will take some time to go from A to B.
Writepixelfast's speed depends on the bus performence a lot. I would suggest to make a test app that is checking the speed of writepixelfast and readpixelfast only and ask your friend to run it. To make things easy, the app may write the results to a text file, so your friend can mail it to you.
Especially when you writepixelfast to an image that is located in the VRam, this may be pretty slow because the system has to "take the bus" and no matter how fast the cpu or 3d chip is, if there's rush hour, it will take some time to go from A to B.