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RTorrent vs qBittorrent vs Deluge

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Pulsed Media seedboxes running PMSS support three torrent clients: rTorrent (with ruTorrent), Deluge, and qBittorrent. All three are installed and managed by PMSS, with per-user instances and cron watchdogs that restart crashed processes automatically.

This page compares the three clients to help you decide which to use. The short answer: rTorrent is the default and handles most workloads well. qBittorrent has a more modern interface. Deluge is the lightest on resources.

Comparison table

rTorrent + ruTorrent qBittorrent Deluge
Default on PMSS Yes No (available) No (available)
Web interface ruTorrent (feature-rich, plugin ecosystem) Built-in WebUI Built-in Web UI
Protocol SCGI socket HTTP API JSON-RPC
RAM usage (idle, ~500 torrents) ~100-200 MB ~150-300 MB ~80-150 MB
CPU usage Low Low-moderate Low
Max torrents (practical) Many thousands (RAM/IO-bound, not client-bound) ~1,000 before the WebUI slows 300-500 before the web UI slows
RSS feeds Via ruTorrent RSS plugin Built-in RSS Via plugin
autodl-irssi Yes (ruTorrent plugin) No No
Labels/categories ruTorrent labels plugin Built-in categories Built-in labels
Move on complete Via autotools plugin Built-in Built-in
API for automation XMLRPC WebAPI JSON-RPC / Deluge client
Radarr/Sonarr support Yes Yes Yes
Mobile apps ruTorrent mobile view Transdroid, qBittorrent Remote Transdroid

How many torrents can each client handle?

Only one of the three scales past a ceiling you will hit in normal use, and it is the reason rTorrent is the default.

rTorrent's limit is not the client — it is the server's RAM and disk I/O. It is a single C++ process with almost no per-torrent overhead, so its torrent count climbs with the hardware, not with a hardcoded wall. On Pulsed Media seedboxes we have run customers past 13,000 active torrents on a single rTorrent instance. Add memory and faster storage and it keeps going.

qBittorrent handles a few hundred torrents comfortably. Past roughly a thousand, the WebUI starts to lag — the daemon copes, but the browser interface becomes slow to load and act on. It is a better fit for a curated library than for a large racing stack.

Deluge is the lightest of the three at low counts, but its web interface becomes unresponsive above 300-500 torrents. It suits a small, low-overhead setup, not scale.

If you are running thousands of torrents — a large private-tracker seed stack, for instance — use rTorrent. It is the default on PMSS partly for this reason: nothing else in common seedbox use holds that many torrents on the same hardware without slowing down.

rTorrent with ruTorrent

rTorrent is a terminal-based BitTorrent client written in C++. On PMSS seedboxes, it runs as a background daemon with a SCGI socket, and ruTorrent (a PHP web frontend) provides the graphical interface.

The ruTorrent web interface on a Pulsed Media seedbox — the default rTorrent frontend, shown with an empty torrent list.

Strengths

rTorrent has been the standard seedbox client for over a decade. It handles many thousands of torrents on a single instance without significant resource growth. The ruTorrent web interface has a mature plugin ecosystem:

  • autodl-irssi for automatic downloading from IRC announce channels (private tracker users rely on this heavily)
  • RSS for feed-based automatic downloads
  • Disk quota display showing your seedbox storage usage
  • File manager for browsing and downloading files
  • Autotools for moving completed downloads to organized directories
  • Themes (MaterialDesign is the default on PMSS)

PMSS compiles rTorrent and libtorrent from source rather than using Debian packages. This gives a consistent, tested version across all Debian releases.

Weaknesses

The ruTorrent interface looks dated compared to qBittorrent's WebUI. rTorrent configuration is done through .rtorrent.rc files, which have unusual syntax. If rTorrent crashes during a hash check on a large torrent, it may need to redo the check on restart.

rTorrent development has historically been slow, though the project remains maintained.

PMSS integration

  • Instance management: checkRtorrent.php watchdog (every 2 minutes)
  • Config: /home/USERNAME/.rtorrent.rc (generated from PMSS template)
  • Socket: /home/USERNAME/.rtorrent.socket
  • Session: /home/USERNAME/session/
  • Restart: create /home/USERNAME/.www/.rtorrentRestart or use the GUI button

qBittorrent

qBittorrent (specifically qbittorrent-nox, the headless version) has a modern built-in web interface that feels closer to a desktop application.

Strengths

The WebUI is clean and responsive. Built-in features cover most needs without plugins: RSS feeds, categories, automatic torrent management, sequential downloading, and a search engine. The WebAPI is well-documented, making it easy to integrate with Radarr, Sonarr, and custom scripts.

qBittorrent is actively developed with frequent releases.

Weaknesses

No autodl-irssi support. For private tracker users who rely on IRC announce channels for racing, this is a dealbreaker. RAM usage is higher than rTorrent for the same number of torrents. At very high torrent counts (1000+), the web interface can become sluggish.

PMSS integration

  • Instance management: checkQbittorrentInstances.php watchdog (every 2 minutes)
  • Config: /home/USERNAME/.config/qBittorrent/qBittorrent.conf
  • Access: reverse-proxied through lighttpd
  • External port: randomized per user at provisioning

Deluge

Deluge is a lightweight client with a minimal web interface. On newer Debian releases, PMSS installs it from apt packages. On Debian 10, it is built from source.

Strengths

Lowest resource usage of the three. Good for users with small quotas who want to minimize overhead. The plugin system supports label management, auto-extraction, and scheduling. Deluge's thin client mode allows connecting a desktop Deluge client to the seedbox daemon for a more desktop-like experience.

Weaknesses

The web interface is basic compared to ruTorrent or qBittorrent. No RSS support in the web UI without plugins. Scales poorly above 300-500 torrents (the web UI becomes unresponsive). Less commonly used on seedboxes, so fewer community guides exist.

PMSS integration

  • Instance management: checkDelugeInstances.php watchdog (every minute)
  • Access: reverse-proxied through nginx at /deluge-USERNAME/
  • Enable: create /home/USERNAME/.delugeEnable
  • Config: /home/USERNAME/.config/deluge/

Which client should you choose?

Use case Recommended client
Private tracker racing (autodl-irssi) rTorrent + ruTorrent
General torrenting, modern interface qBittorrent
Thousands of torrents rTorrent
Low resource usage Deluge
Radarr/Sonarr automation Any (all three work)
New to seedboxes qBittorrent (most intuitive UI)

If you have no strong preference, stick with rTorrent. It is the default on PMSS, has the widest private tracker support (autodl-irssi), and handles the most torrents with the least resources at scale.

You can switch between clients without losing your downloaded data. The files stay in your /home/USERNAME/data/ directory regardless of which client manages them. Contact support if you want to switch your active client.

Because the data survives the switch, trying another client costs nothing but the switch itself. All three are installed on every Pulsed Media seedbox, including the free plans, so the choice is not one you have to get right first time.

Frequently asked questions

How many torrents can a seedbox run?

With rTorrent, into the thousands on a single instance — the ceiling is the server's RAM and disk I/O, not the software (see the client breakdown above). qBittorrent's WebUI slows past about a thousand; Deluge's past 300-500. See How to Choose a Seedbox to match a plan to your workload.

Which torrent client uses the least RAM?

Deluge, at low torrent counts — roughly 80-150 MB idle against rTorrent's 100-200 MB and qBittorrent's 150-300 MB. That advantage narrows as the count climbs, because rTorrent's per-torrent overhead is lower; at high counts rTorrent is the more memory-efficient of the two heavier options.

Can I switch clients without losing my downloads?

Yes. Your files live in /home/USERNAME/data/ and stay there no matter which client manages them. All three are installed on every Pulsed Media seedbox, so trying another one costs nothing but the switch. Contact support to change your active client. Compare the plans themselves on the Seedbox Feature Comparison page.

See also

Knowledge base:

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