Until all players are on XBSX, it won’t matter how quickly it loads because you’ll have to wait for the slowest player. It’ll take years for the numbers of XBSX users to eclipse the number of XB1 users, so unless you are mandating that you have to be on the latest console, I unfortunately believe you’ll see no benefit.
I’ve been running for time in Escape with Lena and Portals for quite a while. That involved a ton of restarts and therefore backing out to the lobby and loading back in to the hive. Please note that Lena and I have a relatively strong PC while Portals is using an Xbox.
I for myself tested the different loading times between my PC and my super old Xbox and the difference was about 1 minute for just loading into the hive from the lobby.
Lena and I have been playing with other people on Xbox that mainly had only one difference to Portals. They weren’t using an SSD. Same type of Xbox (I believe even One X?) but no SSD. And the difference of the loading times was quite a chunk.
Whenever we play with someone on Xbox without an SSD, when we back out to the lobby, we can not immediately start again once we’re in the lobby, otherwise the Xbox player will be stuck in the lobby forever and the pod will never appear for us. Also the mutator loading screen usually stays until almost the end of the background sound.
However when playing with someone with a SSD, we actually can immediately start the hive again without waiting. Also the mutator screen doesn’t stay there until almost the end of the background track.
Therefore I believe you’ll notice exactly that difference that I described above. If you already had a SSD, about little to no difference. If you hadn’t, about a difference of 1min.