How to Speed Up a Slow Laptop: 15 Fixes That Actually Work

A laptop rarely gets slow for one reason. Four resources — processor, memory, storage and thermal headroom — are each asked for slightly more than they can give, and the delays stack up. That is why generic advice disappoints. Deleting files will not help a machine short on RAM, and adding RAM will not help one running a decade-old spinning disk.

These fifteen fixes run from highest impact and lowest effort down to the more involved work. Before any of them, find what is actually limiting your machine. For more, browse the TechLein technology tutorials and reviews library.

First, Find the Real Bottleneck

On Windows, press Ctrl+Shift+Esc for Task Manager and open the Performance tab. On macOS, open Activity Monitor from Applications, Utilities. Leave it open while the machine is being slow — the idle reading tells you nothing.

• CPU near 100 percent for long stretches means something is computing badly. Sort by CPU to find it.
• Memory matters as pressure, not percentage. On Windows, watch whether “Committed” exceeds physical RAM. On macOS, the Memory Pressure graph is the honest indicator — yellow or red means the system is swapping.
• Disk at 100 percent active time with low transfer rates is the signature of a mechanical drive doing random reads.
• Heat shows up indirectly: performance fine for two minutes, then collapsing, fans loud.

If only browsing is slow while local apps open instantly, the laptop is not the problem. Work through a slow Wi-Fi troubleshooting guide instead.

The 15 Fixes

1. Cut Startup Programs

Every app that launches at login competes for CPU and disk during the first minutes of a session, exactly when you want responsiveness, and many stay resident afterwards. On Windows, use Task Manager’s Startup apps tab, which rates startup impact. On macOS, System Settings, General, Login Items — check the login list and the background extensions below it. Disable updaters, launchers and helpers for software you open occasionally, and leave security software alone.

2. Close Tabs and Audit Extensions

Browsers isolate tabs into separate processes for security. Good design, expensive in memory. Dozens of open tabs running scripts can consume more RAM than everything else combined, and extensions are worse per unit of usefulness, since each injects code into every page you load. Chromium browsers have their own task manager at Shift+Esc showing memory per tab and extension. Remove anything you do not use weekly.

3. Stop Background Apps and Sync Clients

Cloud storage clients, photo libraries and game launchers keep working when you are not looking, and a sync client re-indexing a large folder will saturate a slow drive for a long time. Sort by CPU and by Disk, then ask whether the top consumer is doing anything you need now.

4. Replace a Mechanical Hard Drive with an SSD

If your laptop still has a spinning disk, this is the largest single improvement available. A mechanical drive physically moves a head to reach data, and operating systems issue thousands of small scattered reads, each waiting on that seek. An SSD has no seek time.

Check what you have: Task Manager’s Performance tab labels each drive HDD or SSD, and macOS System Information reports the medium under Storage. Every Mac in the last decade uses flash.

Two caveats. Back up everything first, because cloning and migration can fail. And opening a laptop may void the warranty on some models — check yours, and note that soldered storage is not user-serviceable.

5. Add RAM if You Are Swapping

When physical memory runs out, the system moves pages to the drive. Paging is orders of magnitude slower than RAM, and it presents as the whole machine freezing briefly whenever you switch applications. The diagnostic is high memory pressure plus disk activity with no obvious cause.

Confirm the memory is socketed before buying. Many thin laptops and all recent Macs solder RAM to the board, making this a new-machine decision — in which case a current laptop buying guide is the better starting point.

6. Scan for Malware and Unwanted Software

Cryptominers, adware and browser hijackers consume CPU by design and are engineered not to be obvious, so a process at steady high CPU that you do not recognise deserves investigation. On Windows, Defender’s Offline Scan runs before the OS fully loads and catches what a normal scan misses. On macOS, check for browser extensions and configuration profiles you did not install. Uninstall trialware too.

A warning: most consumer “PC speed booster”, registry cleaner and one-click optimiser utilities are unnecessary on a modern OS, and some are harmful. They run resident background services, clear caches that must then be rebuilt, or upsell using fabricated problem counts.

7. Free Up Drive Space

Why free space matters depends on the drive type. On a mechanical drive, a nearly full volume forces the filesystem to scatter file fragments across the platter, so every read costs extra seeks. On an SSD the controller needs spare blocks for wear levelling and garbage collection, and when free space runs low it must erase before writing, which stalls the write path.

Either way, keep roughly ten to fifteen percent free. Start with Storage Sense on Windows or Storage Management on macOS, then see this walkthrough on freeing up storage space on a laptop for less obvious consumers like hibernation files and old snapshots. Defragmenting helps a mechanical drive and should never be run on an SSD.

8. Update Graphics and Chipset Drivers

Windows Update supplies functional drivers, often not current ones. Graphics drivers matter because window composition, video playback and browser rendering are GPU accelerated — a generic display driver pushes that work onto the CPU. Chipset drivers govern power management and storage controller behaviour. Take graphics drivers from the GPU vendor and chipset drivers from your manufacturer’s page for your exact model, and avoid third-party driver updater tools. Mac users have no equivalent step, since drivers ship with macOS.

9. Check the Power Plan

Power saving modes cap processor frequency and delay turbo boost. Correct for battery life, wrong when you are plugged in and waiting. On Windows 11, set Power mode to Balanced or Best performance under System, Power and battery. On macOS, confirm Low Power Mode is off in System Settings, Battery. If the laptop is only slow on battery, this is your answer. Windows users will find more in this guide to speeding up Windows 11.

10. Deal With Heat and Thermal Throttling

Processors reduce clock speed when they cannot shed heat fast enough. Dust in the heatsink fins and dried-out thermal paste both reduce heat transfer, so an older laptop may throttle within minutes even though it performs fine cold. Start safe: clear the vents, use the laptop on a hard surface rather than a bed, and confirm the fans spin up under load. Internal cleaning and repasting work well but involve disassembly, static risk and warranty implications. Full procedure in this guide to fixing laptop overheating and thermal throttling.

11. Reduce Visual Effects

Animations, transparency and shadows are cheap on capable hardware and noticeable on integrated graphics. Disabling them does not make the machine measurably faster, but it removes the lag between input and screen response, which is what “slow” usually means subjectively. On Windows, search for “Adjust the appearance and performance of Windows”. On macOS, Accessibility then Display offers Reduce Motion and Reduce Transparency.

12. Run One Security Tool, Not Three

Real-time scanners hook filesystem operations, so every file open passes through them. Two or three products doing this multiplies the overhead and can send them inspecting each other. Pick one and fully uninstall the rest, using the vendor’s removal tool where a normal uninstall leaves drivers behind.

13. Install Pending OS Updates

Pending updates leave background services repeatedly downloading and verifying, and past performance regressions in both Windows and macOS were fixed in later patches. A machine stuck part-way through an update cycle spends real CPU accomplishing nothing. Install everything outstanding, reboot properly, then re-measure.

14. Clean Up a Bloated User Profile

A profile accumulates things that load every session: hundreds of fonts the font service must enumerate, shell extensions loaded into Explorer, and per-user services left by uninstalled software. Font managers deactivate families without deleting them, and on Windows a shell extension manager shows non-Microsoft handlers hooking File Explorer — disabling suspicious ones often fixes right-click menus that take seconds to appear. The symptoms are specific: slow Explorer or Finder, slow file dialogs and slow logins, while applications run fine.

15. Reinstall the Operating System

The last resort, and it works when nothing else does, because it clears every accumulated driver, service and configuration change at once. Back up to two separate destinations and verify you can open files from the backup before you begin, and confirm you have licence keys for what you will reinstall. Windows offers a Reset that keeps files, but a clean install from media removes manufacturer preloads more thoroughly; macOS uses Recovery mode. If this does not restore acceptable performance, the hardware is the limit.

Frequently Asked Questions

Should I add RAM or replace the drive?

Watch Task Manager or Activity Monitor while the laptop is slow. Disk near 100 percent with low throughput on a mechanical drive means replace the drive first. High memory pressure with unexplained disk activity means that activity is swap and RAM is the bottleneck. On many older laptops both are true, and the SSD still comes first.

Do I need a PC cleaner or optimiser?

No. Modern Windows and macOS manage caches, temporary files and scheduled maintenance themselves. Cleaner utilities add a resident background process, and some exaggerate findings to sell an upgrade. Every step here uses tools already on your machine.

Does defragmenting still help?

Only on a mechanical hard drive, where it reduces the seeking needed to read fragmented files. Never defragment an SSD — it writes data without benefit and consumes write endurance. Windows already distinguishes the two and runs the correct maintenance for each.

When is a laptop genuinely too old?

When it already has an SSD, enough RAM for your workload, clean thermals and a fresh OS install, and is still slow. At that point the processor itself is the limit. Also consider it if RAM and storage are soldered, since the two highest-impact upgrades are unavailable, or if the manufacturer has stopped shipping security updates.