For all the things Windows 11 genuinely does right (the list is getting shorter every day), it also manages to do a lot of things wrong — quietly, constantly, and entirely under the hood. A modern Windows install ships with an impressive amount of background services that are always running, always waking up, and always nibbling away at your system's resources, even when you're doing absolutely nothing.

Individually, most of them don't feel like a problem. Turning off a single service probably won't transform your PC overnight or suddenly add ten frames to your games. But that's not really the point. These are background Windows tasks that have no business running on every PC, all the time, regardless of how you actually use your system. Disabling several of these services has no downside in daily use, and sometimes even makes things feel a tad faster and more predictable. Either way, it never hurts to turn them off, and in many cases, Windows 11 feels better for it.

SysMain was only relevant in a bygone era

Now, it's something you'll never bother with

SysMain is one of those Windows services that made a lot of sense once, and then quietly, it outlived its usefulness. Superfetch is what this service was called when it debuted with Windows Vista, and its entire job was to analyze your usage patterns and preload frequently used apps into RAM so they launch faster. On paper, that sounds great. In practice, however, on a modern system with an NVMe SSD and plenty of memory, it's nothing but redundant. Back during the Vista era, masking seek times with aggressive preloading actually mattered and made a difference, since most of the world ran on older, spinning 3.5-inch HDDs. Today, not so much.

You probably won't notice an immediate performance uplift after disabling SysMain, and that's important to be honest about. What you might notice, however, is a system that behaves more predictably. You'll see fewer unexpected and sudden RAM usage spikes. There will be less background disk activity right after booting, and you might even see quicker boot times on your PC; you'll notice it settling down faster instead of churning for a minute or two before it feels usable.

To disable SysMain in Windows 11, press Windows + R on your keyboard to bring up the Run program. Type in services.msc, and hit Enter. In the Services window that opens up, scroll to find the service labeled SysMain, and right-click on it. Open Properties, and in the dropdown menu next to Startup Type, select Disabled. That's it — this 18-year-old, largely-unnecessary Windows background service will be turned off on your PC. Make sure you reboot your PC after doing it, and you might notice improvements to your PC's application start-up time and RAM usage.

Windows Search Indexing is an outdated background service

There are so many incredible tools you can use instead

The Windows Search service is something you don't ever really think about until you stop and ask when you last actually used it. The search function in Windows File Explorer is pretty outdated, and it barely ever does a load of good. When was the last time you actively relied on it to find something, instead of just navigating to the folder yourself?

And yet, this service runs in the background 24/7, indexing files across your drives, constantly touching storage and updating its database in the background. On systems with large libraries, multiple drives, or a lot of small files, that background activity is very real, even if Windows would like to pretend that it isn't.

Just type services.msc into the Run program, open the Services window, and scroll down to Windows Search. Right-click on it and select Stop to cease it, and then right-click again to select Properties. In the Startup Type dialog box, select Disabled from the dropdown menu, and you're good to go.

Turning off Windows Search indexing doesn't break search entirely. You can still search — it just won't be instant, and for most people, that's a non-issue. In fact, disabling the service entirely and replacing it with something you'd actually use from day to day is where the real benefit shows up. Tools like Voidtools' Everything or Bopsoft's Listary search everything faster, but they also change how you interact with your PC. They work as quick launchers, folder jumpers, and context-aware helpers that you invoke intentionally, instead of something that grinds away in the background whether you want it or not.

That shift alone makes Windows feel snappier, quieter, and far more responsive, and it won't be because your PC got faster, but because it stopped doing everything you never asked for.

Connected User Experiences and Telemetry (DiagTrack)

No need to explain why you should be turning this off

DiagTrack is essentially Microsoft collecting your diagnostic data, assuming you have it turned on. Even if you've tried to turn off parts of it, DiagTrack still exists as a constantly running service. This includes usage patterns, system diagnostics, and yes, bits of browsing behavior. There's really no need to explain why that's not something you want running in the background on your personal PC.

Disabling this Windows background service is actually a two-part task. First, head back into the Services menu, stop the service names Connected User Experiences and Telemetry, and then disable it. After that, press Windows + I on your keyboard to open Windows Settings, select Privacy and Security from the right-hand side, and head into Diagnostics & Feedback. Here, make sure you disable Diagnostic Data and set it to off.

From a performance perspective, DiagTrack isn't a monster, but it is always there. It wakes up, it logs, it uploads, and it does so entirely for Microsoft's benefit, not yours. Disabling it removes that background activity and trims a little bit of CPU usage and network chatter at idle.

Then, there's also the Diagnostic Data Viewer, which deserves special mention. It happily consumes close to a gigabyte of storage just to let you see what Windows is collecting about you. With storage being this hard to come by today, it might sound like a joke, but hey, 1024 MB is 1024 MB. Turning off DiagTrack and uninstalling the viewer doesn't affect Windows Update, doesn't break apps, and doesn't impact system stability. It just stops Windows from phoning home so enthusiastically.

You really don't need Update Delivery Optimization

No use for someone with a single PC

Update Delivery Optimization is another Windows service that sounds helpful until you realize what it's actually doing. The idea is rather simple on paper: instead of every PC downloading updates directly from Microsoft's servers, your system can download parts of updates from other PCs on your local network. Then, it can upload those same update chunks to others online.

In theory, this reduces the load on Microsoft's servers. In practice, it means your PC can quietly use your bandwidth and disk activity in the background, even when you're not actively updating. On metered connections, slower networks, or systems that are already doing a lot in the background, this can be more annoying than helpful.

To disable Update Delivery Optimization, type in Windows + I once again to bring up Windows Settings, and select Windows Update on the bottom of the right-hand side. Select Advanced Options, and click on Delivery Optimization. From here, turn off this service by toggling off the Allow downloads from other devices option.

Disabling the Update Delivery Optimization doesn't stop Windows Update from working. Updates still download normally, but just directly from Microsoft instead. The real-world benefit is consistency: predictable download behavior, no surprise uploads, and fewer unexplained spikes in network usage. It's especially worthwhile on single-PC households where there's nothing to "optimize" in the first place. Your system simply does less behind your back, and that alone makes it feel more under control.

Barely anyone requires the Print Spooler service

You can always turn it back on if you need something printed

The Print Spooler is a classic example of a service that exists purely out of habit. Its job is to manage print jobs, and if you don't own a printer, it serves absolutely no purpose. And yet, it runs by default on almost every Windows installation.

Disabling the Print Spooler on a PC that never prints is as close to a free win as it gets. You save a small amount of RAM, remove a legacy background service, and reduce potential security exposure, since the Print Spooler has historically been a favorite attack vector.

Nothing else breaks when you disable the Print Spooler background service. Windows doesn't complain, and your apps don't care, either. From the services.msc menu, find Print Spooler, stop it, and then disable it from Properties. If you ever do need to print something, you can always just re-enable it within seconds. Until then, it's just one less thing sitting in memory, waiting around for a job it will never receive.

Windows 11 insists on doing too much by default

Windows 11 sometimes feels heavy, and it's not because modern PCs are slow. In truth, it feels heavy because it insists on doing too much by default. These background services aren't evil, and they're certainly not catastrophic on their own, but they represent a broader philosophy of assuming that every user needs everything, all the time. You're not going to be chasing magical performance gains by disabling them, and you definitely won't be able to turn Windows into something it isn't.

Instead, you'd be reclaiming control, reducing unnecessary background noise, and letting your hardware focus on the things you actually care about. Strip away enough of the pointless busywork, and Windows 11 stops feeling like it's fighting you and starts behaving like it should have all along.