Monitoring large file transfers and network copies
Copying big files to a NAS or another PC? Learn how to read transfer speed, spot slowdowns and tell network limits from disk limits.
Large copies between PCs, a NAS or a shared folder can take a long time. A live readout shows whether data is actually moving.
What counts as network traffic
Local network traffic passes through your adapter just like internet traffic. A copy to a NAS over Ethernet or Wi-Fi shows up in the upload column, and a copy from it shows up as download. The readout does not distinguish local from internet traffic.
Reading the numbers
Compare the observed speed with what the link can do:
| Link | Rough ceiling |
|---|---|
| Fast Ethernet (100 Mbps) | about 11 MB/s |
| Gigabit Ethernet | about 110 MB/s |
| Wi-Fi | varies widely with signal |
Real speeds sit a bit below these ceilings.
If the copy is slower than expected
- Wrong link. A laptop on Wi-Fi next to a gigabit port is a common cause. Check the active adapter.
- Many small files. Thousands of tiny files copy slower than one big file.
- Disk limits. A slow drive on either end caps the rate.
- Cable or port. An old cable or a 100 Mbps port limits speed.
- Another job. A backup or download shares the link.
Use the tooltip
Hover over the display to see totals sent and received since the program started. After a copy, the total gives a rough size check.
When the display shows zero
If the copy is in progress but the display reads zero, you may be watching a different adapter. See network adapter selection.
Related: measuring network activity during downloads.
Related pages
Measuring network activity during downloads
Use live speed to judge whether a download is healthy.
Network adapter selection
Let NetSpeedDisplay count physical adapters automatically, or pick the Wi-Fi, Ethernet or VPN adapters to measure.
Published 2026-10-17