This is definitely not hardware because I have an i9-12600K, 64GB RAM, a RTX3080, and the program loads up from an m.2 drive. My data is stored on a large NAS-quality hard drive with a 64 MB cache and once the content is loaded, there's little drive access because of the system memory.
The thing is, we all see this, John in TRS19 and up. SP1 Patch in TRS19 helped a bit there and in TRS22, and Plus too. The problem, according to Tony is too many consists on the route. I have found, as I pointed out in the original thread on the same subject, is that if I un-pause while going from Surveyor to Driver everything loads up instantly. As everyone else has pointed out, pausing when moving about in Driver helps load up the assets quickly. Since this all worked perfectly fine before, this is a bug.
I have found that also some tracks are better than others and avoiding the Pro-track the most seems to help the situation but not 100%, so pressing the pause button when moving around in Driver and when exiting back to Surveyor to adjust a consist before continuing, pressing the pause button to un-pause the program before returning to Driver really helps.