BitBlt

the BitBlt operation is not performed by the Windows API. When you call BitBlt, all Windows does is call a function in your video driver that performs the requested operation. (This is the case with many GDI operations.) So you may simply be seeing a performance problem in your specific video card/driver.

 

https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/2cbe4674-e744-41d6-bc61-3c8e381aa942/how-to-make-bitblt-faster-for-copying-screen?forum=windowsdirectshowdevelopment

https://forum.powerbasic.com/forum/user-to-user-discussions/powerbasic-for-windows/10726-bitblt-is-really-slow

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