Thank you for the quick reply!First, indeed that's a crazy amount of cumstains you are trying to generate concurrently
5 seconds sounds like a lot, but that might depend on your CPU and its load. It certainly takes a while even on my 9800x3d. The reason is that this version limits the background generator of cumstains to one thread per source. While previous version spawned a new thread every time it decided to process new collected contacts. And since you have super tiny Maximal Times set on the Advanced tab, basically to their minimum, that was happening A LOT. I don't even want to know how many threads that ended up spawning... Are you sure your CPU was not on fire in v8?
I can bump the number of concurrent processing threads in the next update a little bit. But even then, it would be better to increment those wait times on the Advanced tab. And maybe increment the Generator Loops count ; that will not make it faster, the opposite actually, but considering how many contacts each update needs to process, with only 3 loops it will discard most of them anyway. Then you could probably decrement the amount of secondary streams and still get the same "coverage".
Here is my take on this preset. I based it on the new presets included in v9, they have generally better looking material settings compared to importing v8 presets to v9 - those don't work well since so much has changed. And they mostly get rid of the (imo really bad looking) way-too-visible cumshot spray particles, with much clearer cumshot visuals ; but maybe you prefer the spray look more. It will still take time to process the cumstain contacts, that will need code update to get a bit better. One day, I'd like to move all the cumstain contact processing to the GPU, hopefully it would be possible. But that will take months to develop.
Result after one burst seq:
View attachment 514063
Haha, honestly, I had no clue on most of the options so I just played around with each of them until things felt and looked right

I tested your new preset and wow! It definitely is significantly better! There are still some weird delay where some cum stains appear retroactively out of thin air after 3 - 4 seconds but I'll chalk it up to just my computer for now but most do appear after that single burst. Still, it looks a lot better so thank you so much!