The actual size of the ‘game’ itself isn’t usually that big. It’s the dlls and data files that uses all the size and processing power.
Fallout4.exe is 62.47Mb. (2015)
Cyberpunk2077.exe is 60.53Mb. (2020)
The rest of the difference is in .dlls and raw data that doesn’t need to be loaded right away. So the main screens load very quickly, things needed in the game can be prefetched before the game actually has to show them, assuming you have enough surplus ram.
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