[Grom_PE]

I suppose that is an issue how a specific game was made, not inherent to Unity.

I like to look inside game files and a .zip archive of 1GB unpacking to ~10GB game made me suspicious.

[marcosdumay]

My first guess would be it has lots of uncompressed images or badly compressed videos as artifacts.

[riizade]

Same, but games run uncompressed assets as an optimization measure to trade disk usage for CPU usage, depending on which is the bottleneck for their particular game (iiuc)

So it'd be surprising to me if a developer chose to use uncompressed/lightly compressed assets, and compressing them caused performance to increase; because you're intentionally choosing the tradeoff in the opposite direction the developer did

Of course, there are game developers that are less technical and may not have knowingly made that tradeoff in which case all bets are off, but the games made by those developers tend not to be the kind that require beefy machines to run at 60fps+