why corepack is faster and fitgirl is smaller
 

Only for Corepack and Fitgirl
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It is thread for asking compression questions .
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If i know , i really help you to make a real repack like corepack and fitgirl.

First why fitgirl repack is smaller , because she's using a large dict to compress a game , which make bin as smaller but make installation get some more times than repack time required.
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Second why corepack is faster than other , because they using a srep+lzma to compress but not default setting of srep - which means if dec blocksize is larger than 8mb it cause error and if it is 8mb a normal dec speed can be obtain .
If block of srep is 1mb then dec of srep is faster than normal srep setting.

Question1 : why fitgirl is not faster , because i you have cpu specs equal to fitgirl cpu specs it can possible.

Why fitgirl is not faster and larger , because corepack use srep as dec speed.
fitgirl use's her's private tools so srep lz match is 1024mb to find not all matches and lolzi or lolzx is used to find all matches and compress to smaller.

Corepack Uses srep as primary tool for dec
Fitgirl uses lolzi or lolzx as primary tool for dec

So it is my summary on decompression speed on fitgirl and corepack.
If any question , i will reply it soon . if i know

Thank you for reading:::

This is a typical case of space–time tradeoff.

It's not a general rule. Many of my modern repacks are both faster and smaller than competition. And ofc they are always smaller.

Many repacker are stick with compression alogrithm because i see fitgirl bin files in winhex says srep:l1024+lolzi:1gb.... hence if i use l as 1024 i can't compress a file somemuch
so l256 is optimum to me.

l256 or 1024 ?
it depends on the data.

l means a minimum match length in srep
It is to be small to find all matches in data::
I use -m5f -l128 -c64 -b6mb -a16 to get faster decompression speed

I just don't use srep 3.9 series, has bugs in Win 10.

For bigger games, I use 3.2

For small games, I use 2.94 to force stop virtual memory creation

You could say many of your modern "not so popular game" repacks. Most the popular game repacks done by you, even the modern ones are slower but off course smaller.

Thank for your tips 78372 !

Anyone say why error on unpacking by using this method lzma+srep
Error = Not an srep compressed file .

Only repacks with some custom compression/encryption, which require data rebuilding. Absolute majority of repackers can't do anything if game data is not supported by precomp/pzlib/ztool.

Store and compress already compressed data := you can compress with anything
Here's result
http://ibb.co/d67bKb

Fitgirl is using default script of inno without chaging anythings but she just added mapping function in the script to use with lolz and srep