Are speed tests (e.g. speed.cloudflare.com) on both laptop also giving similar number?
If speed test result is much faster, the bottleneck could be the CPU incapable of encrypting/decrypting data fast enough using the default encryption method used by SCP/rsync. In that case, try unencrypted file transfer instead. Maybe just serve the file temporarily with `python -m http.server`
Then the issue might be in your wireless access point, maybe one of these:
- there is a max speed limit rule added to your access point to limit download/upload speed on one of your laptop. Remove them if you have access to the access point control panel, or use another access point
- the access point is overloaded, too many clients connected and its cpu can't keep up. Use another access point
- you are using 2.4Ghz band and it has a lot of interference in your area, try switching to 5Ghz or 6Ghz band if possible