Is your computer taking forever to boot? Are apps freezing while you are trying to work or browse? You are not alone. In Canning Vale and across Perth, a slow computer is the number one reason people contact me for help. Windows 10 and 11 are powerful operating systems, but they accumulate clutter, bloat and hardware stress over time — and the result is a machine that feels nothing like it did when you first switched it on.
The good news is that in our experience, eight out of ten slow computers are fixed the same day without replacing any hardware at all. Before you get frustrated and start browsing for a new laptop at JB Hi-Fi, work through these 10 troubleshooting steps. These are the exact professional-grade checks we perform at our Canning Vale workshop — in the order that statistically resolves the most cases first. We want you to feel confident and informed about what is happening with your machine, because the best repair starts with understanding the problem.
1. Audit Your Startup Programs
This is the single most common cause of a slow computer boot in Perth, and it is also the easiest to fix for free. Every time you install new software — a game, a printer driver, a download manager, a music or video app — it often silently adds itself to your Windows startup list. Over months and years, this snowballs badly. Your computer ends up trying to load 20 to 40 background programs before you can even open a browser tab. The result is a machine that takes three to six minutes to become usable after switching on, even if the hardware itself is in perfect condition.
What to do: Press Ctrl + Shift + Esc to open Task Manager, then click the Startup tab. You will see a full list of everything that loads the moment Windows starts. Right-click and disable anything you do not recognise or do not need immediately. Be careful to leave your antivirus software and hardware drivers enabled — everything else is fair game.
2. Switch to Best Performance Power Mode
By default, most laptops and many desktops are set to Balanced power mode in order to conserve battery life or reduce electricity draw. The problem is that this setting actively throttles your CPU speed — your processor is deliberately running slower than it is capable of. If you are plugged into mains power, this throttling is doing nothing for you and everything against you.
What to do: Go to Settings > System > Power & Battery and change the Power Mode to Best Performance. You will notice windows open faster, menus feel snappier, and the whole system feels more responsive within seconds of making the change. This costs nothing and takes under a minute.
3. Clear Out Temporary Files and Junk
Windows constantly creates cache files, update leftovers, and temporary data that are supposed to help performance but become a drag on your system when they accumulate. On older machines we regularly find 15 to 30 gigabytes of completely useless temporary files sitting on the drive and eating into the free space Windows needs to operate efficiently.
What to do: Press Win + R, type %temp%, press Enter, and delete everything inside that folder. Windows will skip any files it currently has open. Also open Settings > System > Storage and enable Storage Sense — this automates regular cleanup so your computer stays leaner going forward. For a deeper clean, search for Disk Cleanup, run it as Administrator, and select system files to clean as well.
4. Upgrade from a Spinning Hard Drive to an SSD
If your computer takes more than 90 seconds to boot, or if everything just feels sluggish regardless of what you do in software, a spinning mechanical hard drive is almost certainly the root cause. Spinning hard drives read and write data at roughly 80 to 160 megabytes per second. A modern solid state drive (SSD) does the same job at 500 to 3,500 megabytes per second — that is anywhere from 6 to 40 times faster depending on the drive you choose.
Upgrading from an HDD to an SSD is the single most impactful change you can make to an aging computer. Every customer who has had this done with us has been genuinely surprised by how transformative the result feels. It is not subtle. The machine feels like a completely different device.
What to do: An SSD upgrade with full data transfer starts from $65 labour only if you supply the SSD, or from $150 all-in including a Samsung or Crucial 500GB SSD supplied, fitted and your existing data safely transferred. If your computer is more than three years old and still running a spinning hard drive, this is the best money you will spend on it — and we back every job with a 30-day labour warranty.
5. Scan for Malware and Viruses
Malicious software and Potentially Unwanted Programs (PUPs) are a frequently overlooked cause of a slow computer. Some malware silently mines cryptocurrency using your CPU and GPU in the background. Some sends spam emails. Some logs your keystrokes and uploads data. All of it consumes your processor, your RAM and your internet connection without your knowledge, and all of it makes your computer feel sluggish and unresponsive.
A sudden, unexplained slowdown that appeared out of nowhere is one of the classic signs of a malware infection. Other warning signs include your browser redirecting to pages you did not navigate to, unfamiliar programs appearing in your taskbar, pop-ups warning you to call a phone number about a virus (this is itself a scam), or unusually high CPU usage when you are not running anything demanding.
What to do: Download and run a free scan with Malwarebytes. The free version handles one-off manual scans effectively. Remove anything it finds and restart your machine. If the slowness continues, or if the infection keeps reinstalling itself, a professional clean is the safer path — some malware actively resists removal and the process of manually chasing it often causes more problems than it solves.
6. Check Whether Your Drive Is Nearly Full
Windows uses a portion of your storage drive as virtual memory — an overflow buffer for your RAM. When your drive drops below 10 to 15 percent free space, this system breaks down completely. Windows cannot write temporary files efficiently, programs take much longer to open, and the entire system can slow to a crawl. The problem is especially severe on older spinning hard drives where read and write speeds are already limited by the hardware itself.
What to do: Open File Explorer, right-click your C: drive and select Properties. If you are below 15 percent free space, start by clearing out your Downloads folder, emptying the Recycle Bin, and uninstalling programs or games you no longer use. A quick sort of your Downloads folder by file size almost always reveals large files that can be deleted immediately. Enable Storage Sense under Settings to keep things managed automatically going forward.
7. Check Your RAM Usage and Upgrade If Needed
Random Access Memory is your computer's short-term working memory. When you run out of it, Windows begins using a section of your storage drive as overflow in a process called paging. On a spinning hard drive this is catastrophic — the drive simply cannot move data fast enough to keep up and the entire machine becomes almost unusable. Even on an SSD, hitting your RAM ceiling causes noticeable lag and makes every program feel slow to respond.
Windows 11 requires 4GB as its stated minimum, but in practical daily use 4GB is barely enough to run the operating system itself. If you have a browser open with several tabs, an email client, a music player and a document open at the same time — which is completely normal modern use — you are almost certainly hitting your RAM ceiling regularly without realising it.
What to do: Press Ctrl + Shift + Esc, click Performance, then Memory. Check the percentage in use while doing your typical tasks. If you are consistently above 80 percent, a RAM upgrade will make a real and immediate difference. Upgrading to 16GB covers most everyday users comfortably. We can assess your specific model and recommend the right RAM for it — upgrades start from $55 labour only if you supply the RAM.
8. Resolve Stuck Windows Update Loops
Windows Update failures are more common than most people realise, and they are a significant hidden cause of a slow computer. When Windows gets stuck trying to install an update in the background, it repeatedly attempts the installation, consumes CPU resources, writes and rewrites files to your drive, and can lock your system in a cycle of failed attempts that you cannot even see happening unless you know where to look. If you notice a red shield icon in your taskbar, or if Settings shows a persistent Update failed message, your computer is wasting a meaningful portion of its processing power on this loop.
What to do: Go to Settings > Windows Update and check for any failed updates. Try running the built-in Windows Update Troubleshooter under Settings > System > Troubleshoot. If the issue persists, sometimes the cleanest resolution is a Windows repair install — which rebuilds the Windows core files without touching your personal data. We handle this regularly as part of our tune-up service.
9. Clean for Dust and Replace Thermal Paste — Perth Heat Is Real
Modern processors have a built-in self-protection mechanism called thermal throttling. When the chip reaches a dangerously high temperature, it automatically slows itself down to prevent permanent damage. This is exactly why your computer might feel perfectly fast when you first turn it on in the morning, but become noticeably slower and more sluggish after 20 to 30 minutes of use. The machine is actively protecting itself, but the side effect is that you are using a fraction of the processing power you are paying for.
In Perth's climate, this is a more common problem than in cooler cities. Dust accumulates inside the case and blocks airflow through heatsinks and fans far faster than most people expect. On laptops, the compact design and restricted ventilation make the problem even worse. Combined with thermal paste that has dried out and lost its effectiveness — which happens every three to five years on most machines — overheating is one of the most overlooked reasons a computer slows down over time.
- Your computer gets slower after 20–30 minutes and then feels normal again after it cools down
- Your fans are running very loudly and spinning at maximum speed constantly
- Your laptop is very hot to touch on the bottom surface during normal use
- Your system crashes or shuts off unexpectedly during heavier tasks
What to do: If you have a desktop, use compressed air to clear dust from the vents, heatsink and fans. Never use a vacuum cleaner — the static electricity it generates can damage sensitive components. For laptops, professional disassembly is usually required to safely access the heatsink. Thermal paste replacement combined with a full internal clean starts from $89 and can restore factory performance on machines that have been throttling for years.
10. Adjust Visual Effects and Perform a Clean Windows Reinstall
Windows 10 and 11 ship with a significant number of visual animations, transparency effects and UI flourishes that look polished on high-end hardware but cause real lag on older machines. Disabling these costs you nothing visually in practice and can make a meaningful difference on computers with 4GB of RAM or less.
Quick visual fix: Search for Adjust the appearance and performance of Windows in the Start menu and select Adjust for best performance. This disables all animations at once. You can re-enable individual effects you care about from the same screen.
When all software fixes have been exhausted and the computer is still slow, a clean Windows reinstall is the right call. Windows accumulates years of digital debris over time — broken registry entries, leftover files from uninstalled programs, corrupted system files, fragmented data and misconfigured settings. No amount of optimisation fully resolves a Windows installation that has been running on the same machine for four or five years without ever being rebuilt from scratch.
A clean reinstall does not mean losing your files. The process involves backing up all your personal data first, then rebuilding Windows fresh, then returning your files and setting up your software again. Done properly, it can make a five or six year old computer feel genuinely new. This is also the correct resolution for persistent blue screen errors, repeated crashes that survive driver updates, and Windows update failures that cannot be resolved any other way.
What to do: A full Windows reinstall with data backup starts from $120. All your personal files come back safely. Windows is built completely fresh. Your 30-day labour warranty starts the moment you collect your machine.
How to Quickly Diagnose Why Your Computer Is Slow in Perth
If you have worked through the above and are still unsure which cause applies to your machine, use this quick diagnostic guide to narrow it down and focus your effort in the right place.
- Boot time over 2 minutes: Almost certainly startup program overload, a full storage drive, or an old spinning hard drive. Check startup items in Task Manager first, then check how full your C: drive is.
- Slow after 20–30 minutes of use: Thermal throttling from overheating is the most likely cause. Check for dust buildup and consider a professional clean and thermal paste replacement.
- Sudden slowdown that appeared out of nowhere: Malware should be the first thing you rule out. Run a Malwarebytes scan before doing anything else.
- Slow when multiple programs are open: RAM is likely your bottleneck. Confirm by checking the Performance tab in Task Manager while doing your normal tasks.
- Everything is slow even with just one program open: This points to the storage drive itself — specifically an old spinning HDD — or a Windows installation that needs rebuilding from scratch.
- Specific programs freeze but others are fine: The program itself may be the issue. Try reinstalling the problematic application before assuming the whole computer needs work.
Our Related Computer Repair Services in Perth
Not sure which service you need? Here is a quick overview of what we offer — click through for full details and pricing.
When to Call a Professional Computer Repair Service in Perth
The free steps above — clearing startup programs, freeing up storage space, running a Malwarebytes scan, switching to Best Performance power mode — are always worth trying first. They cost nothing and combined take under an hour. You may find your machine is completely transformed without spending a cent, and that is genuinely the best outcome for everyone.
But if you have worked through the basics and your computer is still slow, or if you are not comfortable opening a laptop to clean the heatsink, reinstalling Windows, or figuring out whether your drive is a spinning HDD or an SSD, that is exactly the situation a professional repair is designed for. We can run a proper diagnostic that identifies the root cause without guesswork, and give you an honest, upfront recommendation about whether a repair or an upgrade makes more financial sense for your specific machine and budget. We will always tell you the truth — even if that truth is that the computer is not worth repairing and you would be better off with something new.
Most slow computer jobs at FixMyPC Perth are turned around same day or next day. Drop-off is available in Canning Vale, and remote support is available Australia-wide for software-related issues. We serve customers across Canning Vale, Willetton, Thornlie, Gosnells, Cockburn, Armadale, Murdoch, Bull Creek and all surrounding Perth southern suburbs.
The Bottom Line on Fixing a Slow Computer
A slow computer almost always has a specific, diagnosable cause. In most cases it comes down to one or two of the ten issues covered in this guide, and the majority are fixable without buying any new hardware at all. Start with the free steps. Clear your startup programs. Check your storage space. Run a malware scan. Switch your power mode. If the problem persists after all of that, a proper professional diagnostic will pinpoint exactly what is wrong in minutes rather than hours of guessing on your own.
At FixMyPC Perth we offer upfront fixed pricing before anything is touched, a 30-day labour warranty on all work, and a no fix, no fee policy on data recovery. We will walk you through exactly what we found, what we did, and why — because an informed customer always gets a better outcome and a repair that actually lasts.