Morning, guys! I noticed having to struggle with latency issues and projects that ran fine before I updated to Windows 10 were now struggling sporadically to play without an occasional glitch or pop!
To my amazement when I checked in the Device Manager, it seems that Windows 10 had reset my internal card back on. These are the two biggies to check for blazing performance with your audio interface.
Open Device Manager.
Software Devices-Disable Microsoft GS Synth
System Devices-Disable Hi-Def Audio Controller. That will take your internal card and it's drivers completely off the system.
These 2 tweaks make all the difference for my computers. In earlier versions, before I found these tweaks, a lot of my projects were having trouble running at 256 and 512. After these 2 simple tweaks my latency will run as low as 90 in ASIO. If it doesn't help just re-enable them. A very simple fix!
I don't know why Windows 10 would have reset these but I thought I would post a reminder to check those. Hope this helps someone.

I had more or less the same issue, i also had to download a new driver for my audio interface
IMO, win 8.1 " performed better "

Even if i did Disable onboard soundcard in BIOS, it would show up and be " Active " in win 10
Had to disable from windows also...

If your soundcard is within your motherboard disable it in your BIOS. If it's a card, strip it out.
Are you sure HiDef audio controller isn't nvidia sound? If so you can simply remove the drivers by updating the drivers and doing a clean custom install.
MS GS Synth is part of Windows.
 
There is a very likely chance after installing Windows 10 you will need to reinstall or (preferably) update your drivers, even if they appear to work.
 
Cheers..

Both cases, it is motherboard. I did have a MOTU 24io audio card in one but it wouldn't get along with the Studio-Captures drivers so I pulled it out and those issues disappeared! I just re-enabled back when I first tried these tweaks and everything worked fine. No re-install at all. Very strange, but I like it! I had a project that would not run below 256 samples in ASIO and with these tweaks the same project will run at 48 samples on a dual core! I don't know if it's Windows 10 voodoo or what but I have never had the performance I'm getting now!
I am patiently waiting for the old dual core to explode as we speak. This is just too good! Scared to even see what the quad core does!

I've also had this happen with updates. After my Win 10 install I shut down everything but my UR44 and it was good for a while. I noticed, quite by accident, that windoze turned them all back on again after a couple of updates. It also reset the sound device to 100% output. Now I check it regularly. 

I'm running the CoolSoft Virtual MIDI synth, so disabling the POS MS Synth makes perfect sense. I had the internal HD audio disabled as a Playback device, but disabling it via Device Manager did, in fact, remove it as a choice in the Playback and Recording device lists.

When testing Win10, I did notice it will turn things on or change the drivers. My wireless N card became a Wireless G in Win10, as well as some USB3.0 shenanigans.
 
Win10 knows what you want and what you need ...trust them.

Sidroe...
 
Thanks for this!  I know it's probably been discussed ad nauseum before but I never had many problems except with huge projects and I'm still on win7... but I just ran latency mon pre and post your suggestion re: disable hi-def audio controller  and latencies just plummeted!  I was happy before but now imagine I'm really gonna be stoked!
 
20 minutes later... just banged up several huge Albion/Project Sam templates full on playing plus some heavy O2 Airwave multis which are quite harsh on the ol' cpu and playing fine at 2ms on my ole Forte which would always sputter at 2ms... thanks again!

Win10 drivers ultimately chucks on third party drivers that were deemed OK several months ago. Fact it most of them aren't and that time has passed, so first thing after upgrade is visit third party sites and get the latest which are bound to be more stable.

I am so glad to see that it isn't just an acid flashback concerning the goings on of Windows 10 and this reset. I have to say that before 10 I was pretty happy with my rigs but it seems to me that after these adjustments the rig is running like an Indy race car! I just checked some more projects that were very CPU intensive and could actually pull the latency back to almost half of what it was. Like I said, I hope nothing explodes or melts because SPLAT has never run this good.