PCs can be complicated beasts. Don’t get me wrong — in 2026, they’re a lot easier to use than they once were. In many respects they’re closer to smartphones, since you can connect a lot of accessories automatically, and hardly think twice about performing a reset if you rely on cloud services. It’s mostly pros that have to worry about backup drives, never mind something as antiquated as IRQs.
What complicates them is the very thing that makes them appealing: their power. They have more and more advanced components, as well as flexible operating systems ready to tackle just about anything, That means there are a lot of turning gears, and if your tech support skills are limited, some problems that will leave you stumped. Heck, I’ve been using PCs since I was six, and I still run into unfamiliar issues occasionally.
One thing I do understand is why Windows PCs seem to slow down gradually if you leave them on 24/7. Frequently they’re for the same reasons that your phone might come to a crawl, although the situation is naturally more complex.
The creeping death (or inconvenience, anyway)
Why your PC eventually becomes slower
There are a surprising variety of factors at play. For a start, some apps are prone to memory leaks — that is, code errors that fail to release memory once a task is finished. Developers do, of course, try to plug as many of these leaks as they can, but their effect can still build up to the point that your RAM has significantly less room. You might not notice leaks if you’re just using Slack or Spotify — but if you’re playing a 3D game or editing video, those leaks can have a huge impact. Such resource-hungry tasks often demand as much RAM as your system has available.
On top of this, PCs can become burdened with “zombie” processes. These may belong to apps that didn’t close properly, and accidentally left the processes they needed running in the background. More commonly, however, you’re going to be dealing with apps that insist on launching several background processes for functions like updates and quick access, regardless of whether you’re actually doing anything in the foreground. Some of the worst offenders in this regard are Google Chrome and Adobe Creative Cloud. Indeed, Chrome and its processes can regularly end up consuming several gigabytes of RAM. Before I upgraded to a PC with 32GB, I often had to force-quit Chrome processes in Task Manager to get reasonable performance out of games.
PCs can become burdened with zombie processes. These may belong to apps that didn’t close properly, and accidentally left the processes they needed running in the background. More commonly, you’re going to be dealing with apps that insist on launching multiple background processes regardless of what you’re actually doing.
Something familiar to many of you may be caching issues. Since RAM isn’t sufficient for many tasks, apps and Windows itself will temporarily cache files on your hard drive. The longer you leave your PC running, the more likely it is that junk files will accumulate. Windows 11 does a good job of automatically scrubbing caches, thankfully, so a reboot won’t necessarily solve anything. That said, strictly speaking, a computer that’s left on may accumulate more junk between scrubs than one that’s allowed some downtime. In extreme cases, cache files can become corrupt or outdated, leading to crashes or other bugs.
There may also be subtler problems at work, such as kernel and device driver fatigue. If you’re unfamiliar, the kernel is the heart of any operating system. “Fatigue” stems from resource conflicts and other errors, which can mount over time. Periodic restarts are essential to give the Windows kernel the freshest possible slate, and you’ll learn more about that in the next section.
If you really want to get into the weeds, yet another concern is resource fragmentation. On a long-enough timeline, the Windows Master File Table (MFT) and memory heap can become fragmented — broken into inefficient blocks. As with caching problems, Windows tries to prevent this, but it’s still a relevant factor.
You should be particularly concerned about fragmentation if you’re still using a platter-based hard drive, also known as an HDD. Whereas SSDs (solid state drives) rely on flash memory, HDDs have to physically seek data blocks by spinning the platter and adjusting the read head. Over time, repeated writes and rewrites will scatter your data, forcing those seeks to take longer and longer. While you should never, ever defragment an SSD, an HDD that isn’t defragged will inevitably slow to a snail’s pace. You should probably be defragging one at least once a week, and avoiding HDDs entirely for your OS or app drives. These days, HDDs are usually reserved for mass file storage functions, such as backups and archival.
What you should do to prevent slowdowns
A few simple pointers
Obviously, given the concept of this guide, the first tip is to restart your PC periodically. And by that I mean use the Restart command in the Start menu — putting things to sleep won’t help at all, and counterintuitively, shutting down preserves too much data. Windows 11 typically has a feature called Fast Startup enabled, which puts the Windows kernel in hibernation to shorten boot times. To eliminate kernel fatigue, that kernel has to reload from scratch. You should still shut down every now and then, but only to give your hardware and power bill a break.
How often do you need to restart, you might ask? There’s no universal answer, but I’d consider doing so at least once per month, and possibly every week. Every day can’t hurt. Keep in mind that if Windows Update or driver software requires a restart, that counts. You may rarely need to trigger anything separately if you stay on top of the update cycle.
Use the Restart command in the Start menu. Putting things to sleep won’t help at all, and counterintuitively, shutting down preserves too much data.
Beyond restarts, be judicious about what’s allowed to run. Under Settings -> Apps -> Startup Apps, toggle off anything that doesn’t actually need to launch every time you boot Windows. Your favorite apps can probably sit in the taskbar. When you’re done using an app, close it completely instead of minimizing it unless you still need it in some capacity. If you’re tech savvy, you should also open Task Manager sometimes to kill unnecessary processes. Be careful — if you don’t understand what you’re killing, you could wreak havoc, albeit briefly. Reloading Windows and/or individual apps will bring things back.
Lastly, regularly defrag any platter drives you have, and delete any apps or files you’re no longer using. Something I haven’t touched on so far is that Windows requires a variable amount of swap space on your boot drive to run smoothly. If you fill your drive to the brim, this may eat into swap space, forcing some functions to take too long as Windows repeatedly deletes and copies data. Besides, the fewer apps you have, the less likely you are to run into memory leaks or zombies.
