Key facts
- Task Manager (Ctrl + Shift + Esc) shows whether CPU, memory or disk is the bottleneck.
- A drive running at 100% disk usage almost always points to an old spinning hard drive.
- Swapping a hard drive for an SSD is the single biggest speed upgrade for an older laptop.
- 8GB of RAM is a practical minimum for Microsoft 365, Teams and a browser together.
- Keep at least 15 to 20% of the drive free so Windows can update and cache properly.
- A laptop that throttles when warm may have blocked vents or dried thermal paste.
Start with Task Manager
Before trying fixes at random, find out what is actually slow. Press Ctrl + Shift + Esc to open Task Manager, click More details if needed, and look at the Processes tab while the laptop feels sluggish.
- CPU near 100%: a program or background process is working hard. Note which one.
- Memory above 85 to 90%: you are running out of RAM and Windows is swapping to disk.
- Disk at 100%: the drive cannot keep up. Very common on older laptops with spinning hard drives.
On a Mac, use Activity Monitor (Applications, then Utilities) and check the CPU, Memory and Disk tabs in the same way.
Ten fixes to try yourself
- Restart properly. Windows Fast Startup means "Shut down" does not fully reset the system. Use Restart, especially if the laptop has been running for days.
- Cut startup apps. In Task Manager, open the Startup apps tab and disable anything you do not need at login: updaters, chat apps, printer utilities.
- Install updates. Run Windows Update and the manufacturer's update tool (such as Dell Command Update, Lenovo Vantage or HP Support Assistant) for driver and BIOS fixes.
- Free up space. Open Settings, then System, then Storage, and use Cleanup recommendations. Empty the Downloads folder and turn on OneDrive Files On-Demand so files live in the cloud until needed.
- Check for malware. Run a full scan in Windows Security. Look for browser extensions you did not install.
- Tame the browser. Each tab uses memory. Chrome and Edge have built-in memory saver settings; turn them on and remove unused extensions.
- Check power mode. In Settings, then System, then Power, set the power mode to Balanced or Best performance when plugged in.
- Check heat. If the fan roars and the laptop slows when warm, it is thermal throttling. Clear the vents and use it on a hard surface.
- Uninstall bloatware and old trial antivirus that conflicts with Microsoft Defender.
- Check the drive's health. In PowerShell, run Get-PhysicalDisk and check the HealthStatus column, or use the manufacturer's diagnostics. A failing drive is slow and a warning that data loss is coming.
When the hardware is the problem
If Task Manager shows the disk pinned at 100% and the laptop has a spinning hard drive, replacing it with an SSD often makes an older laptop feel new. If memory is constantly above 90% with only Outlook, Teams and a browser open, the laptop needs more RAM; 8GB is a practical minimum for Microsoft 365 work and 16GB is comfortable. Some modern laptops have RAM soldered to the board and cannot be upgraded.
Age matters too. If the laptop cannot run Windows 11 because its processor is unsupported, it is also past the end of free Windows 10 security updates. See our guide on Windows 10 end of support. In that case, spending money on upgrades rarely makes sense.
Slow only on the internet?
If programs open quickly but web pages, Teams calls and OneDrive are slow, the problem is probably the connection, not the laptop. Run a speed test on Wi-Fi and then with a network cable. If the cable is much faster, the issue is Wi-Fi signal or channel congestion. See Wi-Fi support.
When to call dijitul support
If you have tried the basics and the laptop is still slow, or you are not comfortable changing settings, we can connect remotely, check what is using resources, look at drive health, remove junk and malware, update drivers and tell you honestly whether an upgrade is worth it or the laptop should be replaced. Remote fixes are £45 an hour + VAT with a 30-minute minimum. For teams, the £99 a month + VAT Complete plan includes IT helpdesk support for your staff. See PC and laptop support and remote IT support.
Frequently asked questions
Why is my laptop so slow all of a sudden?
Sudden slowness usually follows a large Windows update still finishing in the background, a new program running at startup, a nearly full drive or malware. Check Task Manager to see whether CPU, memory or disk is maxed out, then restart.
Will more RAM make my laptop faster?
Only if memory is the bottleneck. If Task Manager shows memory regularly above 85 to 90%, more RAM helps. If disk is at 100%, an SSD will make a bigger difference. Some laptops have soldered RAM that cannot be upgraded.
Does a factory reset speed up a laptop?
Often, because it removes years of software and clutter. Back up first, and make sure you have installers and licence keys for your programs. It will not fix an old hard drive or too little RAM.
Is it worth upgrading an old laptop to an SSD?
If it has a spinning hard drive and can run Windows 11, yes, an SSD is the most noticeable upgrade. If the processor is too old for Windows 11, replacing the laptop is usually better value.
Can dijitul fix a slow laptop remotely?
Yes. dijitul connects remotely, finds what is using resources, cleans up startup apps and malware, updates drivers and checks drive health. It costs £45 an hour + VAT with a 30-minute minimum, and dijitul will say if replacement makes more sense.
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Get it fixed
One-off fixes are £45 an hour + VAT. You'll know the likely cost before we start.