The Windows 10 update also turns your internal soundcard back on!!!! Dis-able that and dis-able the HD Audio Controller in the device manager and you should see some improvement. My latency and load times have substantially decreased!

As someone said, any apparent slowness to boot etc, will/should disappear after a little while, and then you should be booting, shutting down etc faster than ever. Your 'accidental' installation of Windows 10 should turn out to be a serendipitous little accident, as from my point of view Windows 10 is leaps and bounds ahead of Windows 7 (and even more from Windows 8 from what I have heard, I skipped 8), I hope it turns out that way for you, as I find Windows 10 to be by far the best Windows yet.

Re Slow: On my system, Win10 re-enabled indexing on all my drives, including the SSD used for samples. This is especially irritating since I had it off. I observed a 10x load time for EWQL HO projects.
 
Additionally, it takes forever to turn indexing back off, as Win10 visits every file.
 
I would start with checking that.

Sidroe
The Windows 10 update also turns your internal soundcard back on!!!! Dis-able that and dis-able the HD Audio Controller in the device manager and you should see some improvement. My latency and load times have substantially decreased!

Thanks for that tip, Sidroe. It probably would have taken me months to notice that, since I have no speakers connected to my integrated audio interface.

I also noticed it reset all my auto-play options.
 

AllanH
Re Slow: On my system, Win10 re-enabled indexing on all my drives, including the SSD used for samples. This is especially irritating since I had it off. I observed a 10x load time for EWQL HO projects.
 

Good suggestion, Allan! Sure enough, the indexing service was turned back on, and it was indexing frickin' WAVE files. 30 seconds now to open the project that had been taking several minutes.

bitflipper 
Hmm, wouldn't it be great if my Tranzport started working again? Just dreaming.

Hi Dave-
 
My Tranzport works fine under Win 10, so don't lost heart. I had to install the drivers using a compatibility mode, but I can't remember which right now. Maybe XP?
 
-Susan

Thanks, Susan. A few others have also reported that they continue to use the Tranzport, but I could not get it to run under 8.1 no matter what I tried (including XP-compatibility mode). It even crashed my system, so I had to unplug it. But it's a new day, and I do plan to try it one more time now that I'm running a new O/S.

Windows started pushing their Win 10 Threshold 2 this week, esp if you are a Windows Insider.  It is a major update for Win.  It is basically reinstalling it on your machine if you already had it.  The good news is it gives you much more control over updates... the bad news is that since Win 10 is a "service" and not a product, you can only put off the updates and upgrades only for so long before it will cease to function... that's how they get around the pirating etc... 
 
http://www.windowscentral.com/whats-new-windows-10-fall-update
 to read about the changes and improvements...  and you can 'Run... winver' to check to see if you have the Version 1511, but if your computer loaded up the 3Gb file and then acted like it was upgrading Windows again this week, then you prob have it.  I've noticed speed improvements but also noticed issues with the computer signature... had to re-license  AD2 and a couple of other items.  

Says "Version 1511". Maybe that's what it was doing yesterday when it took 10 minutes to start up. 
 
2,048 tiles! Woo hoo! I can make my Start menu look just like Metro!

I live in europe. Are they phasing this update in regions?

carl
Kontakt libs are very quick to load. Play libs still on the slow side.

I did notice the other day that Windows Defender real time protection is always 'ON' when launching,  doesn't maintain the selected off state as it did before.
I always turn it off, several times now I've heard an audible click through my soundcard. This has never happened to me before in any previous version of Windows.

try adding exceptions for your DAW and audio control software to Windows Defender.