Sonar running extremely poorly

I've been using the exact same project template for about a year. It basically consists of the following:

-16 MIDI tracks routed to one instance of Engine (Best Service's sample player)
-16 MIDI tracks routed to Kontakt
-16 Audio tracks, each with two instances of Slate VMR; the first has VCC preloaded into it, the second is empty
-16 buses each routed to a pre-master bus; these each have VMR preloaded with VCC, and about 6 of them have VTM

As I said, I've been using this exact template for a long time and it's never given me any issues, even after loading several GB worth of sample libraries and filling all of the VMRs with modules. However, starting with the last two updates, I've noticed that SPlat is severely lagging, even upon initially loading this template (before I've even started recording or processing anything). This is immediately noticeable when scrolling through the tracks. Whereas it used to look smooth as butter, now it looks like I'm watching a movie with a really poor frame rate. The tracks kind of jump in position rather than smoothly scrolling. Also, if I double-click on the console button to make it full screen, the graphics kind of fill in from left to right rather than immediately changing to full screen like it used to.

I haven't changed anything in my template between SPlat updates, yet my system is running this template more and more poorly.

I tested whether a simple project runs poorly or not by loading a blank project and just filling it with MIDI and Audio tracks and it runs perfectly smooth.

So, I know that the plugins I have loaded are for some reason not playing nicely with SPlat anymore, but I want to know the reason. Again, this exact template, even when fully loaded with VIs, modules, and tracks used to run without skipping a beat. Now it's stuttering graphically from the start. Also, as the project gets more complex, I'm getting CPU spikes and audio glitches.

Lastly, simply saving my project takes at least 10x longer than it used to. Before when I'd hit CTRL+S, the project would save in about 1/2 to 1 second. Now it's taking upwards of 10 seconds to save. This is even when there's nothing loaded except the initial template. What in the world is going on here?

This is very frustrating. Any tips on figuring out the source of all this trouble would be greatly appreciated.

Thanks everyone!

Certainly there were also updates from windows.
Take a look at the energy options. Maybe the harddrive sleeps after 5 minutes and thats way saving takes a long time.

some times i have had a song which shows this issue and have found that if i create a new one although identical as the first the issue is not there. it didn't happen often only once or twice but starting it from new solved it. yes it can be a pain depending but for me it has worked even though everything was the same like plugins number of tracks and everything.