You do realize that S397 has pretty much locked in a 3 month release schedule right? This week we saw a small hotfix for the IR 18 Indycar that corrected the P2P operation. But most items apparently will not see the light of day until August at the soonest. The sound engine will take care of itself as more cars are converted to the full sound bank. I was hoping they would drop the sound updates piecemeal as each car was finished, but it looks like those will come in chunks each quarter. I have an AMD card instead of an Nvidia and I don't notice stutters, even with the sparks. I wonder if we can make a survey of users, I'm sure 90%+ use NV, but I'm curious if AMD folks see the stutters like NV users do.
I have Nvidia RTX 2070 Super and I don't see sttuters with sparks enabled. I'm running on GNU/Linux that converts DX11 calls to the Vulkan API but I think there are more Nvidia users on Windows that don't see the issue. It might be related to other settings.
They shared a workaround, and I guess they're working to meet the next deadline. I'm pretty sure they'll release a fix when it's ready. I work in software development (not related to S397) and sometimes you have to decide what's more important, fixing the non-breaking bug with a workaround that affects 1% of users or processing the queue of pending work for the next deadline. I'm not saying that those 1% of users aren't important, but there's a 100% of users waiting for other features and bug fixes.