There are few things more frustrating than sitting down at your laptop, clicking on something and then just… waiting. The spinning circle. The frozen screen. The feeling that your machine is working against you. If your laptop has slowed to a crawl, you’re not alone — it’s one of the most common complaints we hear at Mojoo. The good news is that most slow laptops can be fixed, often without replacing the machine entirely. Here are the eight most common reasons — and what you can do about each one.
1. You’re Still Running a Spinning Hard Drive (HDD)
This is, by a long way, the single biggest cause of a slow modern laptop. Older laptops — and plenty of budget ones sold right up until a few years ago — came fitted with a traditional spinning hard drive (HDD). These use actual spinning magnetic disks to read and write data, and they are genuinely slow compared to what’s available now.
A solid state drive (SSD) has no moving parts. It stores data on chips, more like a USB stick than a record player. The difference in real-world speed is dramatic: a laptop that takes three minutes to start up with an HDD will often boot in under 20 seconds after an SSD upgrade. Programs open instantly. The whole experience feels like a new machine.
If your laptop is more than three years old and nobody has upgraded the storage, there’s a good chance it still has a spinning drive. We can upgrade your HDD to an SSD from £80 — it’s the single best value improvement you can make to an older laptop.
2. Too Many Programs Starting Up With Windows
Every time you install a new piece of software, it often adds itself to the startup list — meaning it loads in the background every time Windows boots. Over time, this list grows and grows. Spotify, OneDrive, Teams, Zoom, browser updaters, printer software, game launchers — they all quietly queue up at startup, gobbling up your RAM and processor before you’ve even opened a browser tab.
You can manage this yourself: press Ctrl + Shift + Esc to open Task Manager, click the “Startup apps” tab, and disable anything you don’t need running immediately. Be cautious — don’t disable anything you don’t recognise without looking it up first.
3. Not Enough RAM
RAM (Random Access Memory) is your laptop’s short-term working memory. When you have too many things open — a browser with 15 tabs, a spreadsheet, a video call — and not enough RAM to hold it all, Windows starts using the hard drive as a temporary overflow. This is called “paging” and it makes everything dramatically slower, especially if you still have that spinning HDD from point 1.
Most modern tasks need at least 8GB of RAM. Many older budget laptops shipped with just 4GB. If your machine slows noticeably once you have a few things open, RAM could be the issue. Not all laptops allow RAM upgrades (some have it soldered to the motherboard), but many do — it’s worth checking.
4. Full Hard Drive (Less Than 10% Free Space)
Windows needs free space on your drive to operate properly — for temporary files, virtual memory, and general housekeeping. When a drive gets above roughly 90% full, performance can drop noticeably. If you’re getting “low disk space” warnings, that’s almost certainly contributing to your slow laptop.
Start by emptying the recycle bin, running Windows’ built-in Disk Cleanup tool, and clearing out your Downloads folder. Large video files, old installer packages, and duplicate photos are common culprits. If you genuinely need more space, an SSD upgrade solves both problems at once.
5. Malware or a Virus Running in the Background
Malware — viruses, spyware, adware, cryptominers — doesn’t usually announce itself. It sits in the background, using your processor and internet connection without you knowing. Signs include: the laptop running hot for no reason, the fan running constantly, slowdowns that appeared suddenly, or the browser redirecting to strange websites.
A full malware scan with a reputable tool (Malwarebytes is a good free option) is worth running. If the infection is deep-rooted, a clean reinstall of Windows is sometimes the only thorough solution. Our virus and malware removal service covers both.
6. Windows Needs Updating
Pending Windows updates — particularly large feature updates — can cause a laptop to run sluggishly for days while they download and prepare in the background. If your machine has been slow since a recent update, or if you’ve been ignoring the “restart to finish installing updates” prompt for weeks, this could be the culprit.
Go to Settings → Windows Update and let it finish what it’s doing. Restart properly once it’s done. Counterintuitively, letting updates complete often makes things faster, not slower, in the long run.
7. The Laptop Is Overheating
Modern processors have a built-in self-protection mechanism: when they get too hot, they deliberately slow themselves down to reduce heat. This is called thermal throttling, and it’s your laptop choosing to go slowly rather than damage itself.
It’s caused by dust blocking the vents and cooling fans — a very common problem in laptops that are more than two or three years old. You might notice the machine getting very warm on the underside, the fan running loudly and constantly, or performance dropping after 20–30 minutes of use. A professional clean of the internal cooling system can make a significant difference, and in some cases replacing the thermal paste on the processor helps too.
8. The Laptop Is Just Old — When Is It Worth Upgrading vs Replacing?
Sometimes a laptop is slow because it’s genuinely at the end of its useful life. A rough guide: if it’s more than seven or eight years old, still running a spinning hard drive, and has less than 8GB of RAM that can’t be upgraded, the economics of repair start to look less compelling.
However, if the chassis is in good shape and the issue is just slow storage, an SSD upgrade at £80–£120 can extend the working life by three to five years — far better value than buying a new machine. We’ll give you an honest assessment when you bring it in. We’ll tell you if it’s not worth spending money on.
Quick Fixes You Can Try Right Now
Before you do anything else, try these three safe steps:
- Restart properly. Not sleep, not hibernate — a full shutdown and restart. This clears the RAM and forces Windows to reload cleanly. Many people leave their laptops in sleep mode for weeks at a time, and a proper restart alone can make a noticeable difference.
- Check your startup apps. Open Task Manager (Ctrl + Shift + Esc), go to “Startup apps,” and disable anything unnecessary. Look for things like Spotify, OneDrive, Steam, or manufacturer bloatware.
- Run Windows Disk Cleanup. Search for “Disk Cleanup” in the Start menu, run it on your C: drive, and tick all the boxes. It’s completely safe and can recover several gigabytes of space on an older machine.
If you’ve tried all three and the laptop is still painfully slow, it’s likely one of the hardware or software issues higher up this list.
When to Bring It In
If your laptop is still crawling after the quick fixes above, it’s worth getting a proper diagnosis. At Mojoo in West Bromwich, we’ve been sorting out slow laptops for over 25 years. We’ll identify the actual cause rather than guessing, give you a straight answer on whether it’s worth fixing, and only carry out work you’ve agreed to.
Common fixes that make a real difference: SSD upgrades from £80, RAM upgrades, virus and malware removal, thermal cleaning, and Windows reinstalls. Most jobs are turned around same-day or next-day.
Call us on 07958 468 173, visit our computer repair page, or find out more about our laptop and PC upgrade options. We’re based at 4 Atlas Grove, West Bromwich, B70 9EB.
