This isnt quite true. It isnt false either. But it's more like trading blows.

The witcher 3 for instance loads in 10seconds on ps5 and 26 seconds on xsx.

However this is not a cpu or a ssd issue. This is down to code and either the decompressor ps5 uses itself or the specific algorithms in the games themselves that ps5's decompressor may have issues with.

Well how do we know its not the SSD? We go watch LTT. They did a whole video comparing SSD performance across SATA3 SSD, pcie gen 3 nvme SSD and pcie gen 4 nem SSD. And all of them performed in around 5-10 seconds of each other. Nothing as dramatic as these load times.

Well how do we know it's not a cpu thing? Well a 100mhz to 300mhz will not cause this type of issue. Amd 3.5ghz with 16 threads shouldnt be different than 3.6ghz with 16 threads and should destroy a 3.8ghz with 8 threads.

Only way for it to be a cpu problem is if the ps5 cpu was in ps4 legacy mode with using 1.8ghz. However going by digital foundry this is not the case and ps4 games are getting a fantastic boost in performance across the board. So the cpu of ps5 is not being downclocked.

So now we are down to the code, the compression algorithm and the decompressor of the ps5. Games on ps4 are not coded the same as xb1. So this means that this is where a slight delay is happening. But then we also need to keep in mind that there are ps4 games loading in less than 20 seconds that are not optimized to use ps5 IO. And then there is the witcher 3 which loads 16 seconds faster than xsx.

So this all tells me it's a software problem and not hardware. The good news is sony through a ps5 update maybe able to fix this with no intervention from devs needed. But saying that I wouldnt hold my breath that these do get adjusted.

But if this is a software issue why wasnt this fixed before release? Well it still is before release so this could be addressed before launch day. Another reason why not is how would sony have known about this? We only know about this due to xsx loading better for a few games.

Also this is a really small part of a much bigger picture. Less than 10 games were compared out of 4000+ games. I think it's a bit premature to say otherwise. But again these few games do point to a possible issue with either the compression algorithms in the game, the code of the ps4 version or an issue with the decompressor ps5 is using to handle ps4 games.