Hi,

have you tried using read-bitmap? 
https://docs.racket-lang.org/draw/Drawing_Functions.html?q=read-bitmap#%28def._%28%28lib._racket%2Fdraw..rkt%29._read-bitmap%29%29

Personally I have only used the second constructor that takes a parameter 
named "in" here:
https://docs.racket-lang.org/draw/bitmap_.html

I didn't notice any performance problems, but my images have much lower 
resolution.

I resize my images by using the bitmap function which returns a pict, then 
using scale-to-fit, then using pict->bitmap to convert back to a bitmap.

Hope that is helpful,
otherwise you could provide an example that I can test on my computer, I am 
on linux.

Good luck!
Simon

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