Good Internet Speed for a NAS Home Server — Synology, QNAP, and Remote Access
A NAS (Network-Attached Storage) serves files locally at Gigabit speeds and remotely over the internet. Remote access speed is limited by your home internet — specifically upload. Test your upload at instantspeedtest.net/.
NAS Remote Access Speed — By Use Case
| Use Case | Upload Needed | Download Needed | Notes |
|---|---|---|---|
| Remote file access (documents) | 5 Mbps | 5 Mbps | Small files download quickly |
| Remote video playback (1080p) | 10 Mbps | 5 Mbps | NAS transcodes for remote client |
| Remote 4K video playback | 25+ Mbps | 10 Mbps | Direct play requires fast upload |
| Offsite backup TO NAS | 5 Mbps | 50+ Mbps | Backup upload to home NAS |
| Surveillance camera recording | 2–5 Mbps upload per camera | — | Upload from cameras to NAS |
| Plex/Jellyfin remote streaming | 10–25 Mbps | 5 Mbps | Depends on transcode quality |
Why Your Upload Speed Limits Your NAS Remote Performance
A NAS serving files remotely uses your home internet’s upload bandwidth. If your upload is 20 Mbps (typical cable), remote 4K direct play requires the full 25 Mbps upload — leaving nothing for other activities. Cable’s asymmetric upload is the primary limiting factor for NAS home servers. Fiber’s 100–500 Mbps symmetric upload enables multiple simultaneous remote users, 4K direct play without transcoding, and remote backup without saturating the line. For NAS users with Plex or Jellyfin: enable hardware transcoding on supported NAS models (Synology DS423+, QNAP with Intel CPU) to reduce bitrate for remote clients — a 25 Mbps 4K file transcodes to 8 Mbps 1080p, manageable on cable upload. See our upload speed guide.
Related Guides
- Good Upload Speed Guide
- How to Improve Upload Speed
- Fiber vs Cable Internet
- Speed for Online Backup
- Speed for Video Surveillance
- Wired vs Wireless Speed
Frequently Asked Questions
Does a NAS slow down home internet for other users?
A NAS actively serving remote files or backup consumes upload bandwidth — which can affect other upload-sensitive activities (video calls, gaming). For local-only NAS use (home network file sharing), there’s no internet bandwidth impact. For Plex/Jellyfin with remote viewers: configure your NAS and Plex to limit remote streaming bandwidth (e.g., 10 Mbps per stream) so it doesn’t monopolize your upload. Multiple local viewers on the same home network don’t consume internet bandwidth — only remote access does.
What is the maximum remote speed of a Synology NAS?
Local Synology NAS speed: up to 1–10 Gbps on local Gigabit or 10GbE network. Remote speed: capped by your internet upload speed. A Synology DS923+ connected via Gigabit Ethernet to a fiber router with 1 Gbps symmetric can theoretically serve remote files at 1 Gbps — but your ISP upload speed is the actual ceiling. In practice, home ISP upload speeds of 50–500 Mbps are the real limit, not NAS hardware capability.