How to Speed Up a Slow Windows 11 PC in 2025 — 12 Fixes Every UK User Should Try
There is nothing more frustrating than a slow PC. You click something, wait. Open a browser tab, wait. Try to load a spreadsheet, wait. If your Windows 11 machine has gone from fast to frustratingly sluggish, you are not alone — and you probably do not need to buy a new computer. Most UK users can dramatically speed up a slow Windows 11 PC with a handful of targeted fixes that take less than an hour.
We have compiled the 12 most effective performance fixes for Windows 11 in 2025, ranked roughly from quickest to most involved. Start at the top and work your way down — most people find their problem resolved within the first five fixes.
Fix #1: Disable Unnecessary Startup Programmes
This is the single most common cause of a slow Windows 11 PC, and it takes 30 seconds to fix. Every programme that launches at startup competes for your CPU and RAM before you have even opened your first application.
How to do it:
- Press Ctrl + Shift + Esc to open Task Manager
- Click the Startup apps tab (left sidebar in Windows 11)
- Look at the Startup impact column
- Right-click any programme you do not need immediately at startup and select Disable
Common offenders include Spotify, Discord, Teams, OneDrive, Adobe Creative Cloud, and various manufacturer utilities. Disabling these does not uninstall them — they just will not launch automatically when you turn on your PC. You can still open them manually whenever you need them.
Expected impact: If you had 15+ startup programmes, disabling the unnecessary ones can cut your boot time by 30-60 seconds and free up significant RAM.
Fix #2: Enable Storage Sense to Automatically Free Space
Windows 11 accumulates temporary files, cache data, old Windows Update files, and Recycle Bin contents that can consume gigabytes of space. When your drive is more than 90% full, performance degrades noticeably.
How to do it:
- Open Settings > System > Storage
- Toggle Storage Sense to On
- Click Storage Sense to configure it
- Set it to run Every month
- Enable Delete files in my Recycle Bin if they have been there for over 30 days
- Enable Delete files in my Downloads folder if they have not been opened for more than 30 days
For an immediate clean-up, click Run Storage Sense now. On a typical PC that has never been cleaned, this can reclaim 5-20GB of space.
Fix #3: Check for Malware and Unwanted Software
Malware is a more common cause of slow PCs than most UK users realise. Cryptominers, adware, and background trojans can consume significant CPU and network resources without any visible symptoms beyond general sluggishness.
How to do it:
- Open Windows Security (search for it in the Start menu)
- Click Virus & threat protection
- Click Scan options
- Select Full scan and click Scan now
A full scan takes 30-60 minutes depending on your drive size. Let it complete without interruption. Windows Defender has improved dramatically in recent years and catches the vast majority of threats without needing third-party antivirus software.
If Windows Defender finds nothing but you still suspect malware, download and run Malwarebytes Free (malwarebytes.com) for a second opinion. It is free for on-demand scanning and catches certain threats that Defender misses.
Fix #4: Update Your Drivers (Especially Graphics)
Outdated drivers — particularly graphics drivers — can cause performance issues, screen stuttering, and application crashes. Windows Update handles most driver updates, but graphics drivers often need manual attention.
How to do it:
- Open Settings > Windows Update and install all pending updates
- Click Advanced options > Optional updates and install any driver updates listed
- For graphics drivers specifically, visit your manufacturer's website: nvidia.co.uk/drivers, amd.com/drivers, or intel.com/download
If you are unsure which graphics card you have, press Win + R, type dxdiag, and press Enter. The Display tab shows your graphics hardware.
Fix #5: Adjust Power Settings for Performance
By default, many laptops and some desktops run in 'Balanced' power mode, which throttles CPU performance to save energy. Switching to 'Best performance' can make a noticeable difference, particularly on laptops.
How to do it:
- Open Settings > System > Power & battery (or Power on desktops)
- Under Power mode, select Best performance
On laptops, this will reduce battery life, so you may want to switch back to 'Balanced' when unplugged. On desktops, there is no downside to keeping it on 'Best performance' permanently.
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Fix #6: Disable Visual Effects and Animations
Windows 11 is a visually polished operating system, but those smooth animations, transparency effects, and rounded corners consume GPU and CPU resources. On older or lower-spec hardware, disabling them can make the interface feel significantly snappier.
How to do it:
- Open Settings > Accessibility > Visual effects
- Toggle off Transparency effects
- Toggle off Animation effects
For more granular control:
- Press Win + R, type sysdm.cpl, press Enter
- Click the Advanced tab, then Settings under Performance
- Select Adjust for best performance (disables all visual effects) or manually uncheck specific effects you do not need
The interface will look less polished, but the responsiveness improvement on older hardware is immediate and noticeable.
Fix #7: Uninstall Bloatware and Unused Applications
Most pre-built PCs from UK retailers (Currys, Argos, Amazon) come loaded with manufacturer bloatware — trial antivirus software, media players, 'PC optimisation' tools, and games you never asked for. These consume disk space, RAM, and often run background services.
How to do it:
- Open Settings > Apps > Installed apps
- Sort by Size to find the biggest space consumers
- Uninstall anything you do not recognise or do not use
Common bloatware to remove: McAfee trials, Norton trials, WildTangent Games, manufacturer utilities (HP Support Assistant, Lenovo Vantage unless you actively use them), and any 'PC cleaner' or 'driver updater' tools you did not deliberately install.
Windows 11 itself includes some bloatware — Clipchamp, Xbox apps (if you do not game), Microsoft News, and various pre-installed apps. You can uninstall most of these through the same Settings menu.
Fix #8: Upgrade to an SSD (If You Still Have a Hard Drive)
If your PC still uses a mechanical hard drive (HDD), this single upgrade will transform your experience more than every other fix on this list combined. Moving from an HDD to an SSD typically makes boot times 5-10 times faster, application launches near-instant, and file operations dramatically quicker.
A 500GB SATA SSD costs approximately £30-40 from UK retailers like Amazon, Currys, or Scan.co.uk. A 1TB NVMe SSD — faster again — costs around £50-70. For the price of a modest dinner out, you can make your PC feel brand new.
How to migrate: The easiest method is to use free cloning software (like Macrium Reflect Free or Samsung Data Migration if you buy a Samsung SSD) to clone your existing hard drive to the new SSD. No need to reinstall Windows from scratch — everything transfers exactly as it was.
If you do a fresh Windows install on your new SSD, you will need your Windows 11 product key to activate. If you have lost yours, a new Windows 11 Pro key from a trusted UK seller like Softkeys.uk costs just £19.99.
Fix #9: Increase Your RAM
If Task Manager shows your memory usage consistently above 80-90% during normal use, you need more RAM. Adding RAM is one of the simplest and most cost-effective hardware upgrades available.
How to check: Press Ctrl + Shift + Esc, click the Performance tab, and look at Memory. If the 'In use' figure is consistently near your total, upgrading will help.
For a Windows 11 PC in 2025, we recommend a minimum of 8GB for light use and 16GB for comfortable multitasking. RAM prices in the UK are currently very reasonable — an 8GB DDR4 stick costs around £15-20, and a 16GB kit approximately £30-40.
Fix #10: Reset Windows (Without Losing Files)
If you have tried everything above and your PC is still slow, a Windows reset can restore factory-fresh performance without losing your personal files.
How to do it:
- Open Settings > System > Recovery
- Click Reset this PC
- Choose Keep my files (removes apps and settings but preserves documents, photos, and personal files)
- Choose Local reinstall for faster processing
- Follow the prompts
This process takes 30-60 minutes. Afterwards, you will need to reinstall your applications, but your personal files will be exactly where you left them. You will also need your Windows product key to reactivate if prompted.
Fix #11: Check for Hardware Problems
Sometimes a slow PC is not a software problem. Overheating (due to dust buildup, failed fans, or dried-out thermal paste) causes CPUs to throttle their speed dramatically. A failing hard drive can make the entire system grind to a halt.
Temperature check: Download HWMonitor (free, cpuid.com) and check your CPU temperature under load. Anything consistently above 85°C suggests a cooling problem. Cleaning dust from fans and vents, or replacing thermal paste on an older PC, can resolve this.
Drive health check: Download CrystalDiskInfo (free, crystalmark.info) and check your drive's health status. If it shows 'Caution' or 'Bad', back up your data immediately and replace the drive.
Fix #12: Consider a Clean Windows 11 Pro Installation
If your PC has been running for years, accumulating software, drivers, registry entries, and configuration changes, sometimes the cleanest solution is starting fresh. A clean installation of Windows 11 Pro gives you a pristine system with zero accumulated bloat.
You will need a USB drive (8GB minimum) and a Windows 11 product key. Download the Windows 11 installation media from Microsoft's official website, boot from the USB, and install onto a freshly formatted drive.
A clean installation of Windows 11 Pro provides the fullest feature set — including BitLocker encryption, Remote Desktop, Hyper-V, and group policy management — and represents the best long-term foundation for a fast, secure PC.
The Bottom Line: Most Slow PCs Are Fixable
Before you spend hundreds of pounds on a new computer, try these 12 fixes. In our experience, the vast majority of slow Windows 11 PCs in the UK can be restored to near-original performance with a combination of software optimisation (fixes 1-7) and, if necessary, a modest hardware upgrade (fixes 8-9).
The total cost? As little as zero if software fixes solve the problem, or under £60 for an SSD upgrade plus a fresh Windows 11 Pro licence from Softkeys.uk. That is a fraction of the cost of a new PC, and the performance improvement is often just as dramatic.
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Frequently Asked Questions
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