Explore the guide library · Local storage connections
Use comparable transfers and device status to find whether the bottleneck is the connection, disks or workload.
A slow copy to network storage does not automatically mean Wi-Fi is the limiting component. The transfer depends on the source device, file workload, network path and storage server. Separate those factors before purchasing a faster router or network adapter.
Describe the workload
Record whether the copy contains one large file or thousands of small files. Include the transfer direction and source location. A folder of small documents is not directly comparable with a single large video, even when the total size is similar.
Inspect both endpoints
Check the computer and NAS for active backups, indexing, disk operations or other heavy tasks. Synology’s SMB troubleshooting guidance considers both network settings and the health of server and client operation. Preserve the current security configuration while gathering this baseline.
Run a controlled local comparison
- Use a noncritical test file in an authorized share.
- Record the connection type and negotiated rate.
- Repeat with a suitable wired path when available.
- Keep the storage destination and test data consistent.
- Record the range of results rather than only the fastest run.
Interpret the pattern
If wired and wireless transfers reach a similar ceiling while a disk remains busy, investigate storage or workload limits. If the wired comparison is consistently better with quiet endpoints, examine the wireless path. If only one share behaves poorly, review that share’s workload and configuration.
Avoid risky optimization shortcuts
Do not disable signing, authentication or protection simply because an old guide promises more speed. Review current vendor instructions for the actual operating-system and NAS versions.
Finish by testing the real task after a justified change. A synthetic transfer can help locate a limit, but the useful outcome is improved backup, editing or file-access performance in the normal workflow. Keep backups intact and avoid experimenting with the only copy of important data.
Sources and editorial notes
Sources checked 8–9 October 2026. Independent guidance and original illustrations; product comparisons use published specifications rather than hands-on benchmarks. Check the exact model, revision and regional documentation before changing settings.