Guide · Windows
Startup programs, disk, memory, antivirus: how to measure the cause instead of guessing – and when upgrading is pointless.
“The computer is slow” is not a diagnosis but an observation. Before anyone buys more memory or reinstalls Windows, it should be clear what the system is waiting for — and you can find that out in five minutes.
Open Task Manager and switch to the Performance tab. There you will see four values: CPU, memory, disk and network. Watch which of them hits its limit during the slow activity. That is where the bottleneck is — and only a measure aimed there will help.
The most common mistake: buying more memory when the disk is constantly at 100 per cent. That costs money and changes nothing.
In this order
Sorted by how often we actually come across them – not by how often they are written about online.
A computer with a conventional hard drive feels slow under Windows 10 or 11, regardless of all other values. Replacing it with an SSD is the only measure that really makes a difference here – and usually the cheapest speed-up of all.
8 GB is tight today for office work with many open browser windows. If you also use business applications or video conferencing, you will regularly hit the limit.
Every program that starts when you sign in lengthens the wait and permanently takes up memory. Over the years, manufacturer utilities pile up that nobody needs.
An additional antivirus program installed alongside the built-in one means every file is scanned twice. That slows things down noticeably and does not improve protection.
With less than ten per cent free space, Windows becomes noticeably slower because it no longer has room for swapping and temporary files.
If files from the server open slowly but local files open quickly, the cause is the network or the server. Tinkering with the workstation will not help then.
Five measures that are often recommended and make no measurable difference with current versions of Windows.
Frequently asked questions
Almost always, provided the computer is otherwise in good order. For an office PC that is four to six years old, it is the most effective single measure of all — the difference when starting up and opening programs is clearly noticeable.
From around eight years, weigh the working time against a new device. By then, other issues usually come into play anyway: missing drivers, tight memory, an operating system that no longer gets updates.
16 GB is the sensible configuration today for office work with a browser, Office and video conferencing. 8 GB works but is the limit. For CAD, image editing or virtual machines, the requirement is considerably higher.
After you sign in, Windows starts background tasks: checking for updates, updating the search index, the antivirus downloading signatures, cloud storage syncing. This overlaps with your programs starting up.
If it takes longer than five to ten minutes, it is worth looking at the startup programs – or the hard drive is the bottleneck.
Possibly, but much less often than people assume. Modern malware usually keeps a low profile because it does not want to be detected. A noticeable slowdown is more likely to come from the causes listed above.
One exception: if the computer is constantly running at full load for no apparent reason, covert cryptocurrency mining may be behind it. That needs to be checked.
That rarely makes sense. A staggered replacement over two to three years spreads the costs, keeps the fleet evenly up to date and avoids everything falling due at once again in five years.
What we recommend: a list with the purchase year of each workstation and a fixed annual budget. That turns a surprise into a plan.
Dipl.-Ing. Mohamed Khater
Dipl.-Ing. Mohamed Khater founded INFONET Computer GmbH in Cologne in 1992. The order in this article comes from practice: in most cases the cause is the disk – and the most expensive step would have been buying hardware without measuring first.
Inventory
We record the age, specification and condition of all computers and tell you where an upgrade is enough and where a replacement is due. That turns a surprise into a plan.
+49 221 984300-0Switchboard and support hotline
[email protected]Reply within 4 hours on working days
Robert-Perthel-Straße 7250739 Köln – Bilderstöckchen
Mon–Fri 9 am–6 pmEmergency support outside these hours by arrangement
This website works without cookies, without tracking and without advertising networks. For one optional feature we embed content from an external provider. Doing so transfers your IP address to that provider – which only happens if you allow it.
