🚀 go-pugleaf

How fast is the graphics.lib "BltBitMap()" routine?  It seems to me that
setting up the blitter for a copy shouldn't take all that much time. 

However, if you have two routines that copy the same amount of area from one
bitmap to another, and one of the routines does the copy with one blit while 
the other routine does the copy with two half-sized blits, the two half-sized 
blits take noticeably longer than the single copy.

I am using BltBitMap() to do the copies.  For those of you who have experience
writing your own blitter routines, do you think it would it be worth my while 
to write a replacement for BltBitMap()?  How significant would the speedup be?

Thank you in advance,

-Ralph