Discussing slowdowns in the 2.5 GHz range involves analyzing signal behavior and component performance.
Discussing slowdowns in the 2.5 GHz range involves analyzing signal behavior and component performance.
Hi everyone, I'm having trouble understanding my internet connection speed because I'm not very familiar with it. I have a 140 Mbps broadband line connected via a D-Link router (DIR-841). My laptop runs on Aspire E 14/E5-475G and connects directly to the ONU. It shows speeds of 145-150 Mbps, but when using 2.5 GHz it drops to 70-80 Mbps, and even more so when connected via mobile (about 15% slower). I've kept the router and laptop close together, no obstacles, and previously got 100-95 Mbps with the same setup. The firmware is up to date. What could be causing the speed drop on the 2.5 GHz band? Should I reset the router? Thanks.
2.4 GHz offers reduced data rates yet provides longer reach and stronger signal penetration. It's also employed in various protocols including Bluetooth, as well as for wireless peripherals such as keyboards and mice. With increasing numbers of devices and routers using the same frequency band, overall performance tends to diminish.
Are you in a shared space or an individual unit? It seems likely a new router was set up causing interference, which is why speeds are dropping noticeably. A 10-15mbps reduction isn’t significant.
Minimal disruption exists though. A single individual causing sudden interference likely came from a WiFi camera that continuously sends data, slowing your connection. This isn’t limited to WiFi—other technologies share the same frequency and can be detected only with specialized equipment. The safest approach is to obtain a basic estimate of noise levels or signal quality for your WiFi setup. Windows may not show this, but on MacOS you can press Option while clicking the icon, Linux users can check via terminal commands, and some routers display stats for all connected clients. If possible, adjust the router’s channel (preferably 1, 6, or 11) since automatic settings might inadvertently increase interference. Routers generally aren’t very intelligent about channel selection.
The highest speed for 2.4 Ghz Wi-Fi 4 N transmission is 80 Mbps. This indicates your connection is performing adequately. To verify, install Wireshark on various devices and observe network traffic. You might also consider using a virtual machine like Opnsense or another router OS to test performance under load. Another option is NextDNS.io, which offers a simple setup with DNS support for Linux, helping you monitor site requests and filter unwanted traffic. For Android users, RethinkDNS provides local blocking capabilities for domains, IPs, or apps through the F-Droid app store.