Your computer is running slowly

“Slow” covers several different problems. The useful first question is when it is slow: at startup, all the time, only in one application, or only in the afternoon. That distinction points at the cause.

Ten-minute checks

1. Restart properly. Choose Restart, not Shut down. And not just closing the lid — a laptop that has been sleeping for three weeks has never actually restarted. This alone resolves a large share of slowness.
2. Count your browser tabs. Forty tabs will consume more memory than everything else combined. Close what you are not using; bookmark what you want to keep.
3. Check Task Manager. Press Ctrl + Shift + Esc and click More details. Sort by CPU, then by Memory. Whatever is at the top when it feels slow is your answer. If Memory sits above 90%, that is the bottleneck.
4. Check free disk space. Open File Explorer and look at the C: drive. Below about 10% free, Windows slows dramatically. Empty the Recycle Bin and Downloads folder.
5. Check for a pending update. Settings › Windows Update. A machine mid-update is slow, and one waiting to restart often is too.
6. Leave it on and connected for an hour if it is a Monday morning. Updates and security scans run after a machine has been off, and they compete with your work.

Common causes, by symptom

Slow only at startup, then fine. Too many programs launching at boot. Task Manager › Startup apps — disable anything you do not need immediately. Teams, Spotify, and vendor updater utilities are usual suspects. Do not disable anything security-related; if you are unsure, ask.

Slow all the time, everywhere. Usually memory or an ageing hard drive. In Task Manager › Performance › Disk, look at the drive type. If it says HDD rather than SSD, that is very likely your whole problem and the fix is a hardware upgrade — a genuinely transformative one on an older Dell.

Slow only in one application. The application, not the computer. Note which one and tell us.

Slow when opening files from a network drive or SharePoint. Network rather than computer. See the internet and Wi-Fi articles.

Fast in the morning, slow by afternoon. Something accumulating — a memory leak, or too much left open. A daily restart is a reasonable habit.

Fans loud and the case hot. Dust. Desktops accumulate it in the vents and heat makes the processor slow itself down deliberately. Tell us and we will clean it out properly; do not open the case yourself.

Things that will not help

Registry cleaners and “PC optimiser” downloads. These range from useless to actively malicious. Please do not install one — several of the worst infections we have cleaned up arrived this way.

Deleting files you do not recognise from Windows folders.

Disabling SentinelOne or Windows security. It will not make a meaningful difference and it leaves the machine exposed. If you believe security software is causing a specific slowdown, tell us — we can investigate and add an exclusion properly if one is warranted.

Checking the hardware

Dell machines have built-in diagnostics, and they are useful before we consider a replacement:

1. Restart the computer.
2. As the Dell logo appears, press F12 repeatedly.
3. Choose Diagnostics from the boot menu.
4. Let it run — it tests memory, storage, and other components. It takes a while.
5. Note any error code exactly, including the validation code. Those codes are precise, and with one we can often arrange a warranty part without further diagnosis.

Also find the Service Tag — a seven-character code on a sticker on the case, usually the back or underside on a desktop and the base of a laptop. Every warranty and parts conversation starts with it, so it is worth noting now.

When it is time to replace rather than repair

Some honest guidance: if the machine is more than about five years old, has a spinning hard drive, and is limited on memory, you will spend more in lost time than a replacement costs. We are happy to tell you when a machine is worth upgrading and when it is not — ask and we will quote both options so you can compare.

What to tell us

• Slow at startup, always, or only in one application.
• What is at the top of Task Manager when it happens.
• Free space on C:.
• The Service Tag.
• When it changed, and whether anything was installed around then.

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Still crawling? Call 440-991-9980 or email [email protected] with the Service Tag. We can look at the machine remotely and usually tell you within a few minutes whether it is fixable or due for replacement.