Raw pixel performance version 1.11 to 1.35 slowdown?

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I've given these suggestions a try. This first one resulted if very little change

Managed Style:
ibuffer = CreateImage (IMAGE_WIDTH, IMAGE_HEIGHT,1,2)

around 14500 millisecs


This second suggestion slowed things down even more.
SysRam Style:
ibuffer = CreateImage (IMAGE_WIDTH, IMAGE_HEIGHT,1,4)

around 26000 millisecs


Any other suggestions? Has the management of canvases changed since 1.11?

Thanks
Ken