Thirty-one background processes. That’s what we counted on a mate’s three-year-old gaming desktop last week, sitting in Task Manager before a single game had even launched. A top-tier graphics card, a decent Ryzen chip, 16GB of RAM, and the thing still took forty seconds to get from desktop to a browser tab. Nothing was broken. It was just drowning.
That’s the pattern we see over and over when readers ask why their PC is slow. It’s rarely the part people assume is the problem. Everyone wants to blame the CPU or the graphics card because those are the parts with the flashy names on the box. In our experience, the real culprits are boring: a boot drive that’s nearly full, forty things loading at start-up that nobody asked for, thermal paste doing its job worse than it used to, or a Windows install that’s accumulated three years of junk like a share house fridge.
We’re going to go through what’s actually worth fixing, in roughly the order of “cheapest and most effective” to “fine, you’ve earned a new part.” And we’ll argue the mildly unpopular case that for most people reading this, a new CPU is the last thing you should buy, not the first.
Check your storage before you blame anything else
If your boot drive, the one Windows lives on, is sitting above about 85 to 90 percent full, your whole system slows down. This matters more with solid state drives than people realise. An SSD needs free space to manage where it writes data efficiently; let it get too full and write speeds can drop noticeably, which drags out everything from game load times to how fast apps open.
Open File Explorer, right-click your C: drive, check Properties, and see where you actually sit. If you’re close to full, this is the single highest-value fix on this list and it costs nothing. Uninstall games you haven’t touched in six months (Steam and most launchers make this painless), clear out old downloads, and if you’re still tight, Windows’ own Storage Sense tool will do a reasonable first pass at cleaning temp files automatically.
If you’re running an older SATA SSD or, worse, a mechanical hard drive as your boot drive in 2026, that’s genuinely worth addressing before anything else on this list. We’ve written a fuller breakdown of the differences in SSD types explained: SATA, NVMe, PCIe 4 and PCIe 5, and honestly, swapping a tired SATA drive for a mid-range NVMe one is one of the better value upgrades going, usually under $150 for a solid capacity.
Start-up programmes are the quiet thief
Here’s the bit nobody enjoys doing but genuinely should: open Task Manager, click the Startup Apps tab, and look at what’s set to launch the moment Windows boots. We’d bet money you’ll find at least one chat app, a printer utility you haven’t printed anything with since the Scott Morrison government, and two or three bits of bloatware that came pre-installed and never asked permission to run in the background.
Each one of those is stealing CPU cycles and RAM before you’ve even opened anything yourself. Disabling the ones you don’t need takes about ninety seconds and the improvement in boot time, and often general snappiness, is usually bigger than people expect for something this simple.
While you’re in there, it’s worth having a squiz at what Copilot and other background AI features are doing on your machine, since several of them now default to running at start-up on newer Windows builds. We’ve covered how to manage that properly in Copilot in Windows: what it does and how to turn it off, which is useful reading even if you end up keeping it on.
Windows 10 users have a deadline, not just a slowdown
If your PC is still running Windows 10, slowness might be the least of your problems. Microsoft ended free support back on 14 October 2025, and while the consumer Extended Security Updates programme has since been stretched out to run until 12 October 2027, that’s a grace period, not a green light to ignore it forever. An unsupported operating system gradually becomes a bigger security risk even before it becomes a performance one, and the Australian Cyber Security Centre’s guidance at cyber.gov.au is pretty clear that running outdated software is one of the easiest ways to end up compromised. Microsoft’s own support pages confirm the revised Windows 10 end of support timeline if you want to check your own machine’s situation.
If your hardware supports Windows 11 and you haven’t upgraded, that’s worth doing on its own merits, separate from any speed fix. If it doesn’t support Windows 11, that’s a genuine fork in the road for whether you patch up the old machine or start planning a replacement.
Dust, thermal paste and the slowdown nobody checks
This is the one we reckon gets the least attention and deserves more. Modern CPUs and GPUs throttle themselves deliberately when they get too hot, dropping clock speeds to protect the silicon. If your PC has been sitting under a desk collecting dust for two or three years without a clean, there’s a real chance it’s running at reduced speed under load without ever showing an error message. It just quietly gets slower.
Cracking the case open, using a can of compressed air on the fans, heatsinks and filters, and checking that none of the intake vents are blocked by a jacket, a cat, or a skirting board, is free and takes twenty minutes. For anyone comfortable going a step further, repasting the CPU every three to five years on an older machine can bring temperatures down noticeably, though if that sentence made you nervous, it’s a job worth paying a local repair shop for rather than having a crack yourself with a $2,000 graphics card on the line.
Where RAM and storage speed actually matter for gaming
For gamers specifically, the conversation about why your PC is slow usually lands on frame rates, and fair enough, that’s the number everyone’s chasing. But the fix isn’t always the graphics card. If you’re running 8GB of RAM in 2026, that’s genuinely the bottleneck in a lot of newer titles, and 16GB should be treated as the practical minimum now, with 32GB worth considering if you’re streaming, recording, or running a browser with forty tabs open while you play, which, let’s be honest, is most of us.
Storage speed matters too, though less than people think for frame rates themselves. Faster NVMe drives mostly help with load times and how quickly textures stream in during open-world games, rather than boosting the frames-per-second number directly. If you’re chasing smoother gameplay rather than shorter loading screens, RAM and the graphics card do more heavy lifting than the drive does.
One list, because this bit is genuinely list-shaped: the three upgrades that move the needle most for gaming performance on an ageing PC are, in order, more RAM if you’re under 16GB, a faster NVMe boot drive if you’re still on SATA or spinning disk, and a GPU driver update plus a clean reinstall if you haven’t done one in over a year.
The mildly unpopular take: don’t buy a new CPU yet
Here’s our contrarian bit, and we’ll actually argue it rather than just drop it in and move on. Most people chasing a speed fix jump straight to pricing up a new processor, because it feels like the “real” upgrade, the one that proves you’ve done something serious. We think that’s usually the wrong move, and often the most expensive way to solve a problem that storage, RAM or a clean Windows install would have fixed for a fraction of the cost.
A CPU upgrade on most mid-range systems often means a new motherboard too, sometimes new RAM to match, and suddenly a $400 fix has become a $1,200 one. Unless you’re doing CPU-heavy work like video encoding, running a lot of background compute, or you’re genuinely bottlenecked in CPU-bound games (strategy titles with huge unit counts, some simulation games), the processor is rarely the actual reason your frame rate feels sluggish. We’d rather see someone spend $150 on an NVMe drive and $100 on extra RAM than drop over a thousand dollars chasing a CPU bump that delivers a smaller real-world difference than the marketing suggests.
If you are building fresh rather than patching up an old rig, our guide to how to choose a laptop for university in Australia covers similar trade-offs around RAM versus processor spend, even though it’s aimed at study machines rather than gaming rigs.
When a full reinstall is genuinely worth it
Sometimes none of the above gets you there, and the honest answer is that a Windows install accumulates cruft the way a garage accumulates things you’ll “deal with eventually.” Registry bloat, half-uninstalled programmes, driver conflicts from three GPU generations ago. A clean reinstall, backing up your files first obviously, is a genuine reset button and for a PC that’s four or five years old and has never had one, it can feel like a new machine.
It’s a bigger job than the other fixes here, closer to an afternoon than twenty minutes, but it’s still free, and it’s a more honest fix than throwing hardware at a software problem.
So is it actually fun again, or just faster on paper
This is where we’d push back on how most sites frame this topic. A faster benchmark number doesn’t matter if the game still doesn’t feel good to play, and plenty of PCs we’ve seen are technically “faster” after an upgrade while the actual experience, stutter during combat, texture pop-in, inconsistent frame pacing, barely changes. The fixes above target the stuff that actually affects feel: smoother boot-to-game time, fewer background processes stealing frames during the moments that matter, temperatures that don’t throttle mid-session.
Run the free stuff first. Check your storage, trim your start-up list, clean the dust out, make sure Windows itself isn’t the problem before you spend a cent. If after all that your PC still chugs in games that should run fine on your hardware, then yes, it’s time to look at RAM, a storage upgrade, or eventually a new GPU. Just don’t let the CPU be the first thing you reach for, because in our experience it’s rarely the thing actually holding you back.
— Josh Tannenbaum, Gaming Writer, Tech Geek
Featured image: Photo:PantheraLeo1359531, CC BY 4.0.
