Hi, I'm returning to using S1 after using it intermittently.

I recently installed Windows 10.
Pre-WIn-10 projects having spikes to 100%, and accompanying audio stutters.
Very low track counts, up to 10, 0-3 plugs per track. 25%-ish CPU usage according to S1, with these crazy spikes.

I start searching for and implementing PC optimization guides, have done some of those. i thought I did them a few years ago when I was still on Windows 7 Professional, but hey, I have no problem doing them again - I guess Win10 didn't remember them.

Also, I started updating any laptop-specific Win10 drivers that I can (Some could be updated, I guess I hadn't done those in a while, but some didn't exist Win 10).

As I said - am not done with the optimization, but I check old projects - everything has settled down to 15-25% CPU (i..e, it jumps around in that range, even if the song is stopped).

Then I open this one older project, like 45 plugins total.
It's a little out of hand - A few instance of MNotepad are on, bouncing ever few seconds from a few percent to 100 percent cpu.

But S1's own Red Light District is doing it too.

To boot, all S1's drums in the 'Sounds' section are gone. I re-download them. That seems to go fine.

I'm on S1 2.6.5.30360

I can finish the optimization guide I found on Sweetwater's site, or do a better one you recommend.
Of course I'll turn off MNotepad, and finish downloading the rest of S1's instruments, etc.

But, what is going on?
Why the 100% CPU spikes every few seconds on a project that never had any? (and on other projects - though those seem to have vanished).
Why the missing drum loops?

I know this is a lot of problems, and obviously I need to finish re-doing the PC optimizations. I'm just a little surprised to have previously fine projects sound like popcorn with Win 10.

Am I missing something, or should I just keep on keeping on?

Thanks for you insights