A slow computer is the most common reason Melbourne households call us. It’s also the most misdiagnosed — because “slow” can mean half a dozen different things, each with a different cause. The fixes that work for a startup-slow computer are different from those that work for a computer that’s slow all day, which are different again from a computer that’s only slow in the browser. Starting with the right diagnostic check saves time and prevents treating the wrong thing.
The one diagnostic check to do first — Task Manager disk usage
Before anything else, open Task Manager: press Ctrl + Shift + Esc → click the Disk column to sort by usage. Watch it for 30–60 seconds.
Disk at 90–100% constantly
The hard drive can’t keep up. Either the drive itself is failing or it’s a spinning HDD that’s too slow for modern Windows. This is the most common cause of severe slowness. → See the SSD upgrade section.
CPU at 80–100% constantly
Something is consuming the processor. Sort the CPU column to see what. Common culprits: antivirus scan, Windows Update, unknown process (possible malware). → See the always-slow section.
Both below 30%
Hardware resources are fine — the slowness is software. Check RAM usage in the Memory column. If RAM is above 85%, too many programs are open at once. → See the browser/startup sections.
Slow on startup — takes 3–5 minutes to be usable
A computer that’s slow for the first 10–15 minutes after turning on, then becomes normal, has a startup program problem. Programs set to launch at startup are all competing for resources at the same moment — each one loading slows down every other one. Over time, as more programs are installed, more startup entries accumulate.
Disable unnecessary startup programs — takes 5 minutes:
- Open Task Manager: Ctrl + Shift + Esc
- Click the Startup apps tab (or “Startup” in Windows 10)
- Look at the Startup impact column — focus on “High” items first
- Right-click any program you don’t need at startup → Disable
Safe to disable at startup (these still work — they just don’t load until you open them):
Spotify, Teams, Discord, Skype, OneDrive (if you don’t need auto-sync), Zoom, Microsoft Teams, Adobe Creative Cloud, Steam, Epic Games Launcher, printer software (HP, Canon, Epson apps), and most third-party programs. Keep: Windows Security/Defender, your main antivirus.
A second startup cause: Windows Fast Startup — a feature that saves a partial system state to speed up boots — can actually cause problems on some hardware, particularly older machines with HDDs. If startup is consistently slow despite clearing startup programs, try disabling Fast Startup: Control Panel → Power Options → Choose what the power buttons do → Turn off fast startup.
Slow all the time — not just on startup
Slowness that persists throughout the day regardless of what you’re doing is almost always hardware-related — either the drive, the RAM, or heat. The Task Manager check above identifies which. The four causes in order of likelihood:
1. Spinning hard drive (HDD) — the most common cause
A spinning hard drive (as opposed to an SSD) is dramatically slower than modern Windows expects. HDDs were standard until around 2018 — any computer from before that era likely has one. The symptom: Task Manager Disk column constantly at 80–100% even when you’re not doing anything demanding. The fix: SSD upgrade — see the section below. This single change makes more difference than any software fix.
2. Overheating causing thermal throttling
As covered in our laptop overheating guide, a processor that reaches dangerous temperatures deliberately slows itself down to avoid damage. The tell: the computer is slow AND warm/hot to touch AND the fan is running loudly. The fix: dust clean and thermal paste replacement. After a proper clean, idle temperatures typically drop 15–20°C and the slowness disappears entirely.
3. Background program consuming CPU
Sort Task Manager by CPU. If any process uses 30%+ consistently, it’s the cause. Normal temporary culprits: Windows Update (TiWorker.exe) and antivirus scans — these are temporary and the computer returns to normal when they finish. Persistent culprits that need investigation: unknown process names, browser processes, or anything you don’t recognise. Unknown processes consuming high CPU can indicate malware.
4. Insufficient RAM for what’s running
Windows 11 needs at least 8GB of RAM to run comfortably alongside a web browser. Computers with 4GB of RAM (common in budget laptops from 2017–2020) will show high Memory usage in Task Manager. The fix is either adding RAM (possible on most desktop computers and some laptops) or being disciplined about closing programs. If the computer has 4GB and can’t be upgraded, an SSD still helps significantly by improving the speed of Windows’ virtual memory use.
Slow specifically in the browser
If the computer is fine otherwise but the browser (Chrome, Edge, Firefox) is slow — pages take too long to load, scrolling is laggy, tabs take ages to switch — the browser itself is the issue, not the computer or internet connection. Three specific fixes that make the biggest difference:
In Chrome or Edge: press Ctrl + Shift + Delete → select “All time” → tick Cached images and files and Cookies → Clear. This removes gigabytes of stored data that accumulates over months and slows every page load. The browser will feel significantly faster immediately after.
In Chrome: Menu → More tools → Extensions. In Edge: Menu → Extensions. Each extension runs code on every webpage you visit. Even “harmless” extensions like shopping comparisons, PDF viewers, and ad blockers slow every page load cumulatively. Disable all extensions temporarily — if the browser immediately speeds up, re-enable them one by one to find the culprit.
Each open browser tab uses RAM and CPU, even when not visible. Chrome’s own Task Manager (Menu → More tools → Task manager) shows you which tabs are using the most memory. Close tabs you’re not using — or use a tab management extension like OneTab to save groups of tabs without keeping them open.
⚠️ Windows 10 end of support — October 2025
Microsoft ended support for Windows 10 in October 2025
If your computer is running Windows 10, it is no longer receiving security updates. This means new security vulnerabilities discovered after October 2025 will not be patched — making the computer increasingly risky to use for banking, email, and anything involving personal information.
Is the computer also slow? An unsupported Windows 10 machine running on old hardware is the most common scenario we see — slow, potentially vulnerable, and fixable. The options:
✓ If hardware meets Windows 11 requirements
Free upgrade to Windows 11. Most computers from 2019 or newer qualify. We check and upgrade during a visit — takes 45–60 minutes. Combined with an SSD upgrade if needed, this is the most cost-effective outcome.
⚠️ If hardware doesn’t meet requirements
The computer can’t upgrade to Windows 11 and is now unsupported. Replacement is the recommended path — we handle the full setup and data transfer to a new machine.
Check your Windows version: Press Windows key + R → type winver → press Enter. This shows your exact Windows version and build number.
The SSD upgrade — the single most effective fix for a slow older computer
If the Task Manager Disk column is consistently above 80%, and the computer has a spinning hard drive (HDD), an SSD upgrade will transform the experience more than any other single fix. This is covered in detail in our old computer running slow guide, but here’s the summary:
Before SSD (spinning HDD)
- Startup: 3–5 minutes to usable
- Program opens: 30–60 seconds
- File save: noticeable pause
- Disk usage: 90–100% constantly
After SSD upgrade
- Startup: 15–25 seconds
- Program opens: instantly
- File save: no pause
- Disk usage: under 20% normally
We clone the existing drive during the upgrade — all Windows settings, programs, and files transfer automatically. No reinstalling anything. Cost is typically $150–$250 all-in depending on the SSD size chosen. For a computer that’s otherwise healthy, this is well worth it and extends usable life by 3–5 years.
Frequently asked questions
Several things happen over time: Windows grows larger with updates (Windows 10 and 11 are significantly bigger than when originally released), programs accumulate in startup, temporary files and browser caches fill the drive, and — on spinning hard drives — the drive physically slows as it ages and fills up. A 3-year-old computer that “hasn’t changed” has actually been running an increasingly demanding operating system on the same hardware that was adequate when it was new. SSD upgrade + startup cleanup addresses most of this.
Sometimes — but only if the cause is software clutter or a corrupted Windows installation. A factory reset won’t fix hardware-related slowness (HDD, insufficient RAM, overheating) because those causes survive a reinstall. And a reset means reinstalling all programs from scratch, which takes hours and requires product keys and logins for everything. We typically avoid recommending a reset unless other fixes have failed, because the benefit rarely justifies the disruption. The startup cleanup and SSD upgrade approach gets better results with less disruption for most computers.
Be very cautious. Many “PC cleaner,” “registry cleaner,” and “speed booster” programs are either ineffective or actively harmful. They typically: scan quickly and show alarming numbers of “problems” to create urgency, ask you to pay to fix them, and in some cases install additional unwanted software. The legitimate tools for cleaning a Windows computer are Windows’ own built-in Disk Cleanup, the Startup tab in Task Manager, and your antivirus. If you’ve already installed one of these programs and are unsure, we check during visits.
Potentially, yes — for two reasons. First, malware is one of the causes of slowness, so a computer that has become slow for unexplained reasons is worth checking for security issues. Second, if the computer is running Windows 10, it stopped receiving security updates in October 2025, which means new vulnerabilities aren’t being patched. A computer used for banking, email, or myGov on unsupported Windows 10 carries increasing security risk over time. We address both the performance and security angle during a home visit.
Yes — slow computer diagnosis and optimisation is our most common job. We run the Task Manager diagnostics to identify the cause, clean startup programs, check for malware, clear browser caches, assess whether a Windows 11 upgrade is possible, and quote on SSD upgrade if the hardware warrants it. We give an honest assessment of whether the cost of repair is justified against the computer’s age and value before doing any paid work. Our rate is $89/hr with no call-out fee across all Melbourne suburbs. Call 0435 955 429 or book online.
Computer running slow in Melbourne?
We diagnose the cause, fix what’s fixable in one visit, check your Windows 10 status, and quote honestly on SSD upgrade if needed. $89/hr, no call-out fee, all Melbourne suburbs.
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