why precomp encode faster than preflate?

[LeviKing98]

i use precomp to uncompress a zip file with cmd ./precomp -cn ./temp.zip and reencode it with cmd ./precomp -r ./temp.zip.pcf. It takes 1300ms. And decompressed length is 8572784, reconstrucion length is 225091.
At same time, i use preflate to uncompress the deflate stream of zip file above with cmd ./preflate_demp -s ./temp.zip.deflate and reencode it with cmd ./preflate_demo -r ./temp.zip.deflate. It takes 4000ms. And decompressed length is 8572784, reconstruction length is 236398.
I have checked the code of preflate in precomp, it seems to be the same with original source code, so what possibly could be the reason?