I'll preface this with the fact that I don't know the game, but looking at the system requirements on steam, both of those systems are below minimum spec.
Also, it would probably help if the macbook actually was on fedora 41, it reads 40 in the screenshot - so maybe try upgrading that one, since the game runs on the system with actual fedora 41?
zstd is generally stupidly fast and quite efficient.
probably not exactly how steam does it, or even close, but as a quick & dirty comparison: compressed and decompressed a random CD.iso (~375 MB) I had laying about, using zstd and lzma, using 1MB dictitionary:
test system: Arch linux (btw, as is customary) laptop with AMD Ryzen 7 PRO 7840U cpu.
used commands & results:
Zstd:
So, pretty quick all around.
Lzma:
This one felt like forever to compress.
So, my takeaway here is that the time cost to compress is enough to waste a bit of disk space for sake of speed.
and lastly, just because I was curious, ran zstd on max compression settings too:
~11s compression time, ~0.5s decompression, archive size was ~211 MB.
deemed it wasn't nescessary to spend time to compress the archive with lzma's max settings.
Now I'll be taking notes when people start correcting me & explaining why these "benchmarks" are wrong :P
edit:
goofed a bit with the max compression settings, added the same dictionary size.
edit 2: one of the reasons for the change might be syncing files between their servers. IIRC zstd can be compressed to be "rsync compatible", allowing partial file syncs instead of syncing entire file, saving in bandwidth. Not sure if lzma does the same.