From what I gather, most games now generally load in lower resolution assets just so you have something to work with and load in higher resolution ones later.

However there's definitely a limit. I tried running GTAV from a network drive over 802.11n. Chunks of the world were outright missing. So I can only imagine RDR2 being worse.
 
Apr 26, 2021
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It depends on the game and how much stuff it wants to load. In a technical answer, yes, playing an open world game is possible on 30 MB/sec because GTA 3, GTA Vice City, and GTA San Andreas all ran from the PS2's 4x DVD drive, which has a throughput of about 5.3 MB/sec
What about gta 5, rdr2, or far cry 5?
 

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