Please try again for version 253
Tuned up!
I have a test folder of 53 Raw images.
version 253 builds the "fast" thumbs in 9 seconds, followed by a cache build and final thumbs in 4 minutes and 5 seconds; total 4 minutes and 14 seconds.
The previous standard way builds the same 53 Raw images with thumbs taking 1 minuter and 11 seconds, and the cache build 4 minutes and 4 seconds.
Total time is 5 minutes and 15 seconds.
Version 253 saved me a full minute with only 53 raw images to build.!
It isn't important how long it took as my Raw images might be smaller than yours, and my computer slower than yours.
It is interesting to note the "difference" in time.
By the way, if you wish to time yourself, simply go to Edit Preferences, Raw Options, and put the tick dot in "Cache with Early Edit Priority"
That sets QU back to the old system.
Have fun,
Fred