Because you can now just insert a disc into a blue BluRay drive (which you’ll have needed to rip them to disk anyway) on your PC to play them: just like on a real PS3.
If I had to guess, randomly accessing the storage on the disc takes a lot more overhead time compared to reading from an internal drive. Now the emulator is so fast that it can handle the seek time on top of emulating the console.
Fat PS3 was only capable of 1X - 2X Bluray read ~9MB/s while Slim and Super Slim were capable of 6X ~27MB/s (changes over the surface of the disc of course) so I don’t think that’s it. PS3 used a rather shitty BSD FAT32 driver for their 5400rpm laptop drives and SSD upgrades were better but still heavily bottlenecked by said driver.
I can load a decrypted ISO directly in RPSC3 over 1 Gigabit ethernet from a NAS with that inherent horrendous latency (compared to local storage drives, especially random access) and it’ll still load faster than a game would on an actual PS3 on either or even combined storage mediums like many games partial installed to HDD and also used Bluray.
Because you can now just insert a disc into a blue BluRay drive (which you’ll have needed to rip them to disk anyway) on your PC to play them: just like on a real PS3.
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Why did it take 20 years to happen? is the question
Edit: Previling philsophy of history: things just kind of happen.
If I had to guess, randomly accessing the storage on the disc takes a lot more overhead time compared to reading from an internal drive. Now the emulator is so fast that it can handle the seek time on top of emulating the console.
Fat PS3 was only capable of 1X - 2X Bluray read ~9MB/s while Slim and Super Slim were capable of 6X ~27MB/s (changes over the surface of the disc of course) so I don’t think that’s it. PS3 used a rather shitty BSD FAT32 driver for their 5400rpm laptop drives and SSD upgrades were better but still heavily bottlenecked by said driver.
I can load a decrypted ISO directly in RPSC3 over 1 Gigabit ethernet from a NAS with that inherent horrendous latency (compared to local storage drives, especially random access) and it’ll still load faster than a game would on an actual PS3 on either or even combined storage mediums like many games partial installed to HDD and also used Bluray.