Every OPUS 101 Pro Audio machine ships with a set of optimisations designed to squeeze the best possible realtime audio performance out of Windows. But if you've built or bought your own PC, want to give an ailing machine a new lease on life (or just want to understand what we do and why), this article will walk you through every tweak we make, explain what each one does in plain English—and reassure you that none of them will break anything!

Some of these tweaks are well-known in the audio community, while others are surprisingly obscure given how much of a difference they can make. But they all share the same basic goal: keeping your CPU focused on what matters most, which is processing your audio without interruption.

If you've read my article on how your GPU can wreck your audio performance, you'll already be familiar with the concept of DPC latency—the delays caused by drivers and system processes competing for your CPU's time. Many of the tips below are specifically aimed at reducing these delays, while others focus on preventing Windows from doing unhelpful things behind your back at the worst possible moment.

If you have an NVIDIA graphics card, I'd strongly recommend reading that article before continuing here. NVIDIA's drivers are one of the single biggest sources of DPC latency on most systems, and there are several GPU-specific steps you should take that aren't covered below. Get those sorted first, then come back here for the rest.

This article covers the rest of the straightforward stuff—things you can do entirely within Windows in about twenty minutes. If you want to go further, I've written a companion article covering more advanced optimisations involving your BIOS, the Windows Registry, and drive configuration. But start here—you might be surprised how much of a difference these simple changes can make.

Let's get into it.

Enable the Ultimate Performance Power Plan

This is one I have covered elsewhere, but it's worth reiterating as it's one of the single-most effective tweaks you can make to improve audio performance. By default, Windows uses the Balanced power plan, which is designed to save energy by throttling your CPU, storage drives and USB devices when it thinks they're not doing much. That might be a sensible solution for a laptop on battery, but it's the last thing you want on a desktop machine that needs to deliver complex audio data to your interface every few milliseconds without fail.

Windows actually has a hidden power plan called Ultimate Performance which is much more aggressive about keeping your hardware running at full speed. It's not available out of the box on most systems, but you can unlock it by opening Command Prompt as an Administrator and typing the following:

powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61

Once you've run that command, head to Control Panel > System and Security > Power Options and you should see Ultimate Performance listed as an option. Select it and you're done. Among other things, this plan disables sleep and hibernate timeouts, ensures your CPU doesn't throttle itself down unnecessarily, and sets the groundwork for several of the other tweaks below.

This is completely safe and won't cause any harm to your hardware. The only trade-off is a marginally higher electricity bill, since your components won't power down as aggressively when idle. For a professional desktop audio workstation, that's a trade-off well worth making.

Disable USB Selective Suspend

This is a power-saving feature that allows Windows to cut power to individual USB devices when it thinks they're not being used. In theory it's a clever way to save a few watts, but in practice it can cause your audio interface to momentarily drop out and reconnect—which, if it happens during playback or recording, will result in anything from a brief glitch to your audio engine stopping altogether.

The problem is that Windows isn't always great at judging whether a USB device is "idle". An audio interface that's sitting there waiting for your DAW to send it data might look idle from the operating system's perspective, even though it's very much in active use. When Windows suspends it and then wakes it back up a moment later, that interruption can be enough to break the audio stream.

If you've already enabled the Ultimate Performance power plan above, this setting should already be disabled. But it's worth double-checking, because Windows updates have been known to reset power settings. Head back to Control Panel > System and Security > Power Options and click on Change plan settings next to your active plan. Click on Change advanced power settings and look for the USB settings > USB selective suspend setting and make sure it's set to Disabled.

Rest assured, this won't affect your USB devices in any noticeable way. They'll continue to work exactly as before—they just won't be powered down behind your back.

This one follows the same logic as USB selective suspend above, but for a different bus. PCI Express (PCIe) is the high-speed interface that connects your graphics card, NVMe storage drives and some audio devices (such as Avid HDX cards) to your motherboard. Like USB, Windows can put PCIe devices into low-power states when it thinks they're not busy—and like USB, this can cause problems when those devices need to wake up quickly.

For audio work, the most common symptom is NVMe drives introducing tiny delays when streaming samples. If your sampler is pulling data from an NVMe drive that has been put to sleep by PCIe power management, there can be a brief hesitation while the drive wakes up—and if that hesitation is longer than your buffer allows, you'll hear it.

You'll find this setting in the same place as USB selective suspend: Control Panel > System and Security > Power Options > Change plan settings > Change advanced power settings. Look for PCI Express > Link State Power Management and set it to Off.

Again, this should already be off if you're using the Ultimate Performance plan, but it's worth confirming. And again, the only downside is a fractional increase in power consumption that you will never notice on your electricity bill.

Disable Fast Startup

Fast Startup is a Windows feature designed to make your PC boot faster by saving a snapshot of your system state to disk when you shut down. When you turn the computer back on, Windows loads that snapshot instead of doing a full boot from scratch. Sounds great—until you realise it means your PC isn't actually fully shutting down or fully restarting.

For audio work, this can cause a few problems. Driver states aren't always reinitialised cleanly, which means your audio interface, USB devices or storage controllers might come back in a slightly confused state. It can also prevent BIOS and driver updates from being applied properly, since the system isn't going through a true cold boot. And because the saved state includes the kernel and drivers, any accumulated memory leaks or driver quirks from your last session can carry over into your next one.

To disable this feature, once again navigate to Control Panel > System and Security > Power Options and this time click Choose what the power buttons do from the left-hand sidebar. Click Change settings that are currently unavailable (you'll need administrator privileges for this), then untick Turn on fast start-up (recommended) and click Save changes.

Your boot time may increase by a few seconds. In exchange, every time you start your PC you'll get a genuinely clean slate—fresh driver states, properly applied updates, and none of the weird ghost-in-the-machine behaviour that Fast Startup can introduce. It's a trade worth making.

Disable Game Mode

Windows includes a feature called Game Mode which is supposed to prioritise whatever application is in the foreground by reallocating system resources away from background tasks. Sounds like it might actually be useful for a DAW, right? Unfortunately, it does this using heuristics designed for games rather than audio software—and the background processes it uses to monitor and manage performance can actually introduce audio latency.

To disable it, press Win+I to open Windows Settings, click on the Gaming tab from the left sidebar, and set Game Mode to the Off position. (If you also see a Captures option in the same menu, set Record in the background while I'm playing a game to Off as well.)

Remove Windows Bloatware

A fresh install of Windows 11 comes loaded with applications you didn't ask for and almost certainly don't need on a professional audio machine. Candy Crush. Clipchamp. Microsoft News. Groove Music. Xbox Live. These applications consume memory, run background processes, and in some cases phone home to the internet—all of which represents unnecessary overhead on a machine whose sole job is to make music.

(NOTE: Uninstalling certain components can cause system instability. The ones I mention below are safe to remove, but just in case you uninstall the wrong thing, it might be worth creating a System Restore Point first. As a general rule, don't uninstall anything published by Microsoft that looks like a core system component—things like Microsoft Store, Windows Security, or the .NET frameworks. But pre-installed third-party apps and Microsoft's own promotional software are fair game.)

The good news is that most of these can be removed the old-fashioned way. Go to Settings > Apps > Installed apps, find the offending application, click the three dots next to it and select Uninstall. A non-exhaustive and always-changing list of the apps I tend to remove when setting up a new Windows 11 installation is below:

  • 3D Viewer
  • Disney+
  • Family
  • Feedback Hub
  • Films & TV
  • Groove Music
  • Maps
  • Microsoft Clipchamp
  • Microsoft Edge Game Assist
  • Microsoft News
  • Microsoft OneDrive
  • Microsoft To Do
  • Movies & TV
  • Solitaire & Casual Games
  • Sticky Notes
  • Xbox
  • Xbox Live

Work through the list and remove anything you don't use or need. If in doubt, a quick search for the application's name will tell you whether it's safe to remove.

Xbox Game Bar deserves a special mention here. This is Microsoft's gaming overlay—it runs in the background listening for a hotkey to start recording your screen, which means it keeps hooks into your graphics and audio subsystems even when you're not using it. Unlike most bloatware, Microsoft doesn't let you uninstall it through Settings. You can limit its background activity by finding it under Settings > Apps > Installed apps and scrolling down to the bottom where you will see a list of System Components. If you click on the three dots next to Game Bar and select Advanced options you can change Background app permissions to Never. But to remove it entirely, you'll need to open PowerShell as an Administrator (type PowerShell into the Windows search bar and select Run as administrator) then type in the following command:

Get-AppxPackage Microsoft.XboxGamingOverlay | Remove-AppxPackage

Don't worry—if you ever change your mind, you can reinstall it from the Microsoft Store.

It's also worth checking back after major Windows updates, as Microsoft has an irritating habit of reinstalling some of this software when it rolls out feature updates. A quick audit after each update will keep things clean.

Keep Your Drivers and BIOS Up to Date

This isn't so much a tweak as it is general good practice, but it's worth saying explicitly because it's one of the most common causes of audio problems: outdated drivers.

Your motherboard chipset drivers, audio interface drivers and (especially) your GPU drivers should all be kept reasonably current. Manufacturers regularly release updates that fix bugs, improve stability, and—crucially for us—reduce DPC latency. AMD's chipset driver updates in particular have historically included meaningful improvements to USB stability and power management on Ryzen systems.

For GPU drivers, I'd generally recommend sticking with the most recent stable release. If you have a compatible NVIDIA card, look for the Studio Driver rather than the Game Ready Driver—it's tested more thoroughly for professional workloads and tends to produce lower DPC latency. (My article on GPU audio performance goes into much more detail on this.)

And if you've just made a change and something has gone wrong, your drivers are the first place to look. "It was working fine until I updated X" is one of the most common things I hear from people troubleshooting audio issues—and rolling back to the previous driver version is almost always the fix. As mentioned above, it's always good practice to create a System Restore Point before installing new mission-critical drivers.

Advanced Tips

All these changes should make a subtle but noticeable difference to your system's audio performance—and the good news is that none of them involve anything more complex than clicking through a few menus. But if you want to go further, there's a lot more you can do. In my companion article, I'll walk you through some deeper optimisations—disabling CPU power states in your BIOS, editing the Windows Registry to reduce latency, configuring your sample drives for maximum streaming performance, and a few other tricks that can squeeze even more out of your system. It requires a bit more confidence, but if you've made it this far, you're more than ready.