Slow internet in the office — how to find what's causing it
Internet works, but pages take forever and video calls stutter? It's rarely just one cause — usually you can find it in a few simple steps before you report an outage.
Measure first, don't guess
"It feels slow" tells you very little. Run a speed test on any internet speed test site and note the result — first over WiFi, then with your computer plugged directly into the router with a LAN cable.
If the wired result is close to what your provider's plan promises, but WiFi is noticeably lower, the problem is in the wireless network, not the line itself. If both results are low, keep checking the whole network, not just WiFi.
What to check, step by step
Check how many devices are actually on the network
Laptops, phones on the guest WiFi, a smart TV in the meeting room, network printers — every device takes a slice of bandwidth, even when it looks idle, because it's updating in the background.
Check what's running in the background
Cloud backups, large folder syncs (OneDrive, Dropbox, Google Drive), Windows updates running on several computers at once, or streaming in the break room can eat up most of your available bandwidth on their own.
Check for WiFi interference
In an office building with several companies on the same floor, many WiFi networks broadcast on the same channels and interfere with each other. A router placed near a microwave, a metal cabinet, or a thick concrete wall also loses range and throughput.
Check your router's age and class
A consumer router from a few years ago, now suddenly serving a dozen-plus office devices instead of three at home, simply doesn't have the horsepower for it — a common cause of slowdowns in small companies that outgrew their first router.
Check whether the slowdown follows a pattern
Log speed test results at different times of day for a few days. Slowdowns only during peak hours (say, 12:00–2:00 PM) more often point to provider congestion in your area than to a problem in your own network.
When it's a job for IT
- The wired speed is clearly below what your provider promises, even after restarting the router.
- The slowdown is constant, regardless of time of day or number of connected devices.
- Specific business applications (an ERP system, VPN) keep freezing or logging you out.
- The problem appeared suddenly, with no change in device count or how the team works.
How to reduce slowdowns going forward
A business-grade router sized to your device count, a separate guest WiFi network (isolated from the company network), traffic prioritization (QoS) for key applications, and scheduling large updates and backups outside the team's peak working hours are the most common, effective fixes.
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