Easy for you , very hard for me......aid !

Easy for you , very hard for me......aid !
I want a programming compression software (Huffman coding) in c++ , but I have a problem.

my question is very important : how the program compresses data file with a large capacity in a short time? What is the structure programming used in c++, analyzes file all bytes, bytes quickly?
I programming software compresses but : file 1 MB compression in 10 minutes it’s long time !
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