Read on Twitter
1/ About the difference in loading times between #PS5 
and #XboxSeriesX 
:
TL;DR The loading times you see in this test is a result of the raw average performance of each SSD in combination of the average performance of each CPU as BC games are not optimized for next gen consoles
and #XboxSeriesX :TL;DR The loading times you see in this test is a result of the raw average performance of each SSD in combination of the average performance of each CPU as BC games are not optimized for next gen consoles
2/ Initial loading is taxing CPU more than people think. It is not only loading stuff into memory it is also setup data structures from that loaded data. Don't assume that all data comes ready to use in the correct structures it is needed. This takes (CPU) time.
3/ As none of the games on both consoles make any use of optimizations this indicates that the PS5 runs on a lower average performance for CPU & SSD than the Xbox One X does for those BC titles. It also is an indicator that sustained performance beats peak performance.
4/ I saw comments suggesting the difference is non optimized firmware on the PS5. If this would be the case this would also mean that optimized games would have a penalty on loading times too but as tests show this is not the case (e.g. Spider Man:MM).
5/ Then there are the comments suggest that SSD speed is throttled on PS5 to support compatibility. This is also not the case. Even the fastest available SSD on the market is the slowest component of them all that come into play here. Slowest by quite a margin.
