Speed on Ethernet is about 1Mbps, while other devices handle 20Mbps.
Speed on Ethernet is about 1Mbps, while other devices handle 20Mbps.
Hello everyone! I recently assembled my first PC and everything functioned smoothly until I checked my LAN speed using speedtest.net. My download speed was satisfactory, but my upload speed was only about 1 Mbps—much lower than the typical 20 Mbps. I tried various cables and tested it on my laptop to rule out the issue being with the router. A quick search suggested the problem might relate to Large Send Offload (IPv4) settings in the Realtek controller, but that didn’t help. I confirmed the drivers were up to date and didn’t notice any unusual background programs. My motherboard is the MSI B450 Tomahawk MAX with a Realtek PCIe GbE Family Controller. Any advice would be greatly appreciated. Thanks, Alex. Edited June 15, 2020 by alex_tmfk
Confirm if the PC is actually receiving 20mbps and whether you have a laptop available for testing.
You're certain the new PC isn't handling background internet tasks? Microsoft has released significant updates recently. Your Windows system can also share updates with nearby devices through a distributed file-sharing method. If left enabled, other Windows machines on your local network may download updates simultaneously. Are you sure no other device is uploading data at the same time during this test?
Here are some alternative ways to phrase your message:
- I appreciate the advice you gave. My Windows updates are already current, but I just paused them—uncertain if that makes a difference.
- I have only one PC in my network, which includes a printer and a few smartphones connected via Wi-Fi. It shouldn’t be much traffic, especially not over an extended period.
- iCloud is active in the background, but I think the slow speed is due to router settings rather than uploads. This only affects uploads on this machine, though I can try disabling the router and restarting it—maybe that helps.
- I ran a test using NetBalancer to monitor app usage and bandwidth. The upload speed remains very low (around 2Mbps), and no other application is consuming significant bandwidth. Setting Firefox priority high didn’t improve things either.
I resolved my issue by adjusting the speed and duplex settings—switching from 100 Mbps full to 100Mbps half—which improved the upload speed. Thanks to everyone who shared advice and helped.
It allows sending or receiving data, not both simultaneously. When you enable Auto, you're letting the system decide automatically—avoid manually setting values unless you really need to.