Why so slow?!

BlitzPlus Forums/BlitzPlus Programming/Why so slow?!

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Mero
 #1
I worked alot on Blitz3D, and that code ran fast, but in B+ it's awfully slow if I move picture about 640x480, for example, and even WinAMP is glitching!

SetBuffer CanvasBuffer(canvas)
Repeat
Cls
DrawImage imgBack, MouseX(), MouseY()
FlipCanvas canvas
Until MouseHit(1)

Why?
If I put Delay (30) at the end of the loop, it runs much more better...