Define what feels slow
Distinguish one application from every internet service. If a single large download is slow while other websites respond immediately, the remote source may be limiting it. If several services struggle on different devices at the same time, investigate the shared connection. Note whether the problem is continuous or occurs at particular times.
For a short comparison, close unnecessary downloads and pause large cloud transfers when it is safe to do so. Do not forcibly interrupt a backup. A speed test running beside a substantial transfer measures the remaining capacity, not necessarily the connection's performance. Use the same test service where possible and record upload as well as download results.
Make three comparisons with one computer
First test from the normal working position. Then take the same device close to the router and repeat. A substantial improvement points towards the radio path or conditions around the desk. It does not prove that the router is faulty: walls, competing traffic and the client device's antennas also influence the result.
Next, where possible, connect the computer directly to a router LAN port with Ethernet. Turn Wi-Fi off for this comparison so the wired route is unambiguous. Any USB Ethernet adapter must support the speed you need. Also check whether the router port and adapter have negotiated a lower link rate. A limited adapter can otherwise make a capable internet connection appear slow.
If the wired results are poor too, repeat at another time and check the provider's service-status information. If Ethernet and Wi-Fi near the router both work well but the desk does not, concentrate on positioning, coverage and interference. Do not buy a faster internet package solely because of one measurement.
Local transfers offer another clue
If you already have network storage, copy a reasonably large, non-sensitive test file between it and the laptop. This transfer stays inside the local network and normally bypasses the internet connection. Storage performance, disks and the storage device's wired link may still impose limits. Treat the test as additional evidence rather than an exact measurement of maximum Wi-Fi performance.
The connection rate shown in Wi-Fi settings is not the same as usable download throughput. Wireless protocols consume some capacity and conditions can change while a test runs. Compare repeated results and noticeable interruptions. A slightly lower but stable rate can be more useful for calls than a high peak accompanied by frequent dropouts.
Keep enough evidence to act on
A small table containing time, location, connection type, upload, download and observed problems is sufficient. Add whether other devices were affected at the same time. These details help your internet provider or IT contact investigate. Remove customer numbers, full IP addresses and Wi-Fi credentials before posting screenshots publicly.
If results remain contradictory, avoid changing DNS, channels and drivers simultaneously. Repeat one comparison under similar conditions first. That makes it possible to tell whether a later change actually improves the connection rather than merely coinciding with a quieter period.
