10 ways to fix a slow PC

Is your PC wheezing and gasping to cross the finish line? There are a few ways you can restore it to its former speedy glory, before you go to the extreme of buying a new system.

Craig Simms
Craig was sucked into the endless vortex of tech at an early age, only to be spat back out babbling things like "phase-locked-loop crystal oscillators!". Mostly this receives a pat on the head from the listener, followed closely by a question about what laptop they should buy.
Craig Simms
1 of 10 Dusty Computer 7 image by Fons Reijsbergen, royalty free

Clear out the dust

System a bit slow? Remember a time when it used to be faster?

Assuming the memories aren't wishful thinking, there's a bit you can do to clear out the cobwebs and get your computer running up to speed again, both on the hardware and the software side.

So before you pull the plug and buy a new PC, here are a few things you can do to possibly recover some lost speed.

Dust build up over time can impede airflow, and airflow is vital for keeping system temperatures down. If your system overheats, it'll likely throttle its performance down to cope.

Cleaning out the dust is easier if you've got a desktop rather than a laptop — you can still clear the dust away from vents in the laptop, but be wary about opening it up to do a thorough clean, as depending on the vendor this may invalidate your warranty. If you're out of warranty, and you're confident of navigating the maze in most laptops, go for it.

The first step is to remove general dust from around the system. You could use a moist paper towel and cotton buds to get into harder-to-reach areas, but one of the best tools you can employ is a can of compressed air. Make sure to avoid vacuum cleaners — or at least getting overzealous with them. We've known people to have sucked capacitors right off the board. There are other issues with using a vacuum cleaner, too, as Brian Cooley of CNET tells us:

...you might be tempted to stick a vacuum-cleaner hose inside and suck out the dust. Don't. Vacuums create static electricity, which is deadly to sensitive electronic components.

On that same note, don't be tempted to reverse the flow of your vacuum and blow the dust out of the computer. The dust inside a household vacuum can be harmful to your health, and you'll be spreading it all over your PC. Also, you risk blowing out sizable particles, which could physically damage internal components, especially if you're using a workshop vacuum. The beauty of compressed air is that it's clean and particle-free.

Before you start blasting, unplug your computer and take it outside — or at least to your garage. Now, working from the top down, blow out all that dust (put on a dust mask, unless you want a face full of grime) ... be sure to spray air in short bursts, keeping the can upright and the tube at least a couple of inches from the hardware.

Next, you'll want to get your fans and heatsinks clean. Cooley has some tips here, too:

Start by powering down your PC, removing the case lid and locating the various fans. Starting with the power supply, blow through the internal slits from inside the chassis, aiming so dust will exit the back.

Next, blow into the intake fan (if there is one) to push more dust out the back. Finally, blow the blades of the rear exhaust fan clean. If possible, aim just beneath the centre, where the motor meets the fan assembly, and blast again. Repeat the process for each fan, keeping the can upright at all times.

Now restart your PC, and while the fans are spinning, spray them once more — very briefly — to really send the dust flying.

If a fan continues grinding or ticking after you've cleaned it, there's a chance that you can always add extra lubrication. But if this is one step too far, you could always just replace it.

2 of 10 CPU heatsink image by Matt Lauer, royalty free

Reseat the CPU and GPU heatsinks

This is more applicable for the desktop, but the same basic principles apply for a laptop.

There's a small possibility that the thermal conduction between your CPU or GPU and its heatsink isn't optimal, causing things to overheat. If you want to make sure that things are fine, you're going to need some isopropyl alcohol and thermal compound.

Firstly, make sure that the heatsink is attached via mounting holes to the circuit board, rather than directly to the chip. If it appears as if there's no obvious way that the heatsink is held down on the chip, it's using thermal glue or thermal tape to form the bond. If this is the case, ignore and move on, it's unlikely these are causing you issues.

After separating the heatsink from the processor, you'll notice some goop that was last used as a thermal interface. Clean it away by applying a small amount of isopropyl alcohol to a clean cloth and rubbing it until it's gone. Apply a thin but consistent veneer of new thermal paste across the top of the chip (application can be made easier by using a scalpel or old credit card to spread the paste), then reapply the heatsink.

3 of 10 Craig Simms/CBSi

Check your RAM and hard drive

There's every chance that your hardware may not be performing to spec, whether through some kind of fault or mere age.

To make sure everything's running as it should, there are quite a few software tools you can use first before you go on an upgrading rampage, or file a warranty claim. Primarily, though, you'll want to check your memory and your hard drive.

MemTest86+ will cover the memory side, ultimately giving you a bootable DVD or USB key to work with to make sure your RAM has no errors.

You might also want to check the SMART (Self-Monitoring, Analysis and Reporting Technology) details of your hard drive. DiskCheckup will do the job for you — head to the SMART Info tab and make sure all the entries in the Status column read OK. You may also want to perform a Disk Self Test. If either of these reveal problems, it's time to back up your hard drive and get a new one.

Solid-state drives
If you have an older SSD (say, from 2009 or older) that doesn't support TRIM (a command that ensures write amplification is minimised), it may very well have degraded in performance due to extended use. The quickest way to return performance is to secure erase it — but, of course, this requires backing things up, and if your SSD is your system drive it's not for the faint of heart. If you're sure that you're not getting the speeds you should out of your SSD, most SSD vendors provide their own refresh tools, or if you want to do it manually there's a guide here to help you on your way.

4 of 10 Craig Simms/CBSi

Uninstall everything you don't use

No, really, everything; browser toolbars, programs you forgot about, games you didn't finish. See that system tray in the bottom right stuffed to the gills? Thin it down.

Be sensible — leave things like Windows updates and hardware drivers. If you're not sure what something is, grab a friendly geek or leave it alone.

While you could use Windows' in-built uninstaller, something like IObit Installer will allow you to somewhat automate the process by queuing a whole lot of uninstalls at once.

For most Mac apps (Microsoft Office and Adobe Creative Suite are notable exceptions), you can uninstall apps purely by dragging them from the Applications folder into the trash, and emptying it.

5 of 10 Craig Simms

Make more space

Hard drives cope better with a bit of free space (as a general rule, 10 per cent free should keep things happy). There are two easy ways you can help get rid of things if you've been a bit of a digital pack-rat.

CCleaner will help clear away temporary files created by web browsers, install programs and more — and if you haven't done this for a long time (or ever), it can actually make a huge difference. If you're on a Mac, try OnyX.

Space Sniffer, meanwhile, will help you to weed out downloads and files you forgot existed, by showing you a spatial view of what's taking up the most room on your hard drive, allowing you to drill down to the file level, and still access Explorer's right-click menu to delete files. Don't forget you can double click on a folder to zoom in on its contents.

If you're a Mac user, check out Disk Inventory X or GrandPerspective.

6 of 10 Craig Simms/CBSi


This is mainly a Windows thing. While it won't have that much impact on a modern system, and should absolutely not be performed on an SSD, defragging a hard drive could potentially give you that little extra speed boost you're after.

Under Windows XP you can find the defrag tool by right-clicking on your hard drive in Windows Explorer, selecting Properties and then the Tools tab. Click the Defragment Now... button to open the Disk Defragmenter, then click the Defragment button. This can take a long time depending on the size of your storage, so it's best to let it go overnight.

Windows 7 is easier — just click the Windows orb in the bottom left and type defrag, and the Disk Defragmenter application will appear. Click on it, select the hard drive you wish to defrag and then click Defragment Disk.

7 of 10 BitDefender

Get a faster antivirus program

Do you run antivirus? Is it old? Some companies of late have really focused on getting system impact as small as it can get, notably Symantec, whose Norton software is now incredibly trim, but is still fighting its old reputation for bloatware.

Performance impact is a tricky metric to cover; however, for best overall performance and speed we recommend Bitdefender Total Security 2012, followed by Norton Internet Security 2012.

If you're of the free mindset, AVG Anti-Virus Free 2012 provided the lowest average system impact in our tests once scan time was taken into account.

Run a full scan, protect yourself
While we're at it, let's make sure there's no malware on the system that could be slowing your machine down. Run a full scan through your antivirus program, then install Spybot Search and Destroy, update and then do a full scan there, too. Run an immunisation when the scan is done, and if you want to be doubly sure, grab SpywareBlaster as well, update and then perform an immunisation there as well.

8 of 10 Craig Simms/CBSi

Update, update, update

Ensure that both Windows and your hardware drivers are up to date — apart from bug fixes, which should make your system work better, you may be getting new features as well. Graphics card drivers in particular should be kept up to date, as performance improvements are introduced frequently.

One tip: don't use the drivers provided by Windows update. These are often cut down, or sometimes don't even work. Go straight to your hardware vendor (be it Nvidia, AMD, Intel, Creative, Realtek, Marvell, Dell, whatever) for the official software.

XP users can run Windows update by visiting update.microsoft.com, Windows 7 and Vista users can use the in-built Windows Update application.

For OS X, just click the Apple icon at the top left and select Software Update.

Don't forget your browsers
While you're at it, update your browsers as well, especially if you're running Internet Explorer 6. Not only will updating your browser get you new features and bring you in line with the latest standards, allowing websites to render properly; optimisations are being made to JavaScript engines all the time, making modern websites faster.

9 of 10 Got RAM? image by Armin Hanisch, royalty free

Upgrade hardware individually

If you can determine what part is the bottleneck in your system, a simple upgrade will be much cheaper than getting a whole new system. With laptops, your options here are pretty much limited to RAM, hard drive and wireless card, but desktop users will have a little more room to play with.

If you've got less than 4GB of RAM, investigate adding more — with more moving online, and browsers being particularly memory hungry, having more memory is never a bad thing.

Just be aware that if you have 4GB RAM or more, you'll need a 64-bit operating system in order to recognise and use it all — which for some people still running XP might mean an operating system upgrade as well.

Hard drive
The hard disk is typically the slowest part of the computer. When loading data or if you run out of RAM, your hard drive gets hit — and if it's old and slow, you're going to feel it.

While solid-state drives (SSDs) have definitely addressed the speed issue, they're expensive compared to mechanical hard drives and are much lower in capacity. If you can only afford a mechanical hard drive, make sure to get one that's at least 7200rpm. As a basic rule of thumb, larger capacity drives at the same revolutions per minute are faster than smaller capacity drives.

If you're finding games are a bit slow on your desktop, it may be time to update your graphics card. These days, a new graphics card will have significantly more effect on your gaming experience than an updated CPU will.

External, upgradeable graphics on the laptop never really took off — but perhaps we'll see something emerge should Intel's Thunderbolt interface take off.

If you're finding the wireless in your laptop slow and unreliable, it's actually quite easy to swap in a new wireless card in your laptop — it uses a standard interface called Mini PCI Express. Just be aware of a gotcha: some vendors like HP will only allow certain wireless cards to be used in their laptops for warranty and support issues. Others, like Dell, will accept pretty much anything. If you've got a laptop that doesn't like alternative wireless cards, you can always get a high-end USB wireless adapter that should improve performance greatly.

If you've got a friendly laptop, it's a simple case (which, depending on the laptop, may involve removing layers of equipment, admittedly) of disconnecting the antenna wire, removing the old card, putting in the new one, reattaching the wire and then installing appropriate drivers. The hard bit is finding someone that will sell you a decent chip.

Also consider the age of your router — wireless technology is improving all the time, and the more expensive routers generally do provide superior wireless performance. Just remember there's no such thing as a good router brand — stick to models that have had a good response in reviews and online.

10 of 10 Alienware

Last ditch options

Reinstall Windows
Is everything still running slow? It might be time to back up all your files, format your hard drive and then reinstall Windows from scratch. While modern operating systems reduce the frequency in which this is needed, sometimes it's just the only sane way to return things back to how snappy they once were. Plan out at least a day, triple check everything is backed up and that you have some way of getting online in case things go wrong — then dive in.

If you've got a desktop, you'll need your original Windows installation disc. If you've got a laptop, though, you very likely have a recovery partition — somewhere on your hard drive where your manufacturer stores the original state that your laptop arrived in. Usually you can access this by loading Windows' built-in recovery environment, often launched by holding (or in most cases, repeatedly hammering) the proper key from boot. While it can change from laptop to laptop, here's a "rule of thumb" chart for what needs to be done on a brand-by-brand basis to get into the recovery environment.

Acer Press F8 at the Windows boot menu, select "Repair your computer"
Alienware Download and run Alien Respawn in Windows. It can sometimes be found in the Alien Autopsy program.
Apple (OS X Lion and newer) While restarting, hold down the Command + R until the Apple logo shows.
Asus Press F9 at the BIOS loading screen.
Dell Press F8 at the Windows boot menu, select "Repair your computer"
Fujitsu Press F12 at the BIOS loading screen.
HP Press Esc at the BIOS loading screen, then F11 for HP Recovery
Lenovo Run OneKey Recovery software from within Windows
MSI Press F3 at the BIOS loading screen
Samsung Press F4 at the BIOS loading screen
Toshiba Press F8 at the Windows boot menu, select "Repair your computer"

You should then be walked through the process of recovering Windows. There are usually two options, to keep your files or to wipe everything and start again; despite the time it'll take to set up everything again, you'll most likely get the most speed out of the latter option.

It's still slow!
If all the above didn't work, perhaps it's time to finally admit what you own is old hat, and to get a brand new system with much faster parts and a spanking new Windows 7 64-bit operating system. Or a Mac — whatever floats your boat.

As a positive, if you buy a PC these days it will last you significantly longer performance-wise than it would even five years ago, and battery life has improved greatly for laptop users. Even price has dropped massively across the board in the last five years, with laptops under AU$1000 actually representing good value.

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