As everyone has said, lossless compression might not have great ratios, but if it’s still worth it I recommend dwarfs as it creates read only mountable filesystems with minimal setup https://github.com/mhx/dwarfs

Yeah, it almost looks like you’d be able to run things faster than natively on windows, which is why I’m suspicious (not that it’s a lie just that the numbers lack context). It doesn’t say what the numbers represent I think?