Average Swarm Speed
Great, here's how you can compare your speed with the Average Swarm Speed of your torrents:
In the global Statistics
Azureus/Vuze has the Statistics tab, which you can open by
- clicking Tools > Statistics, or by
- double-clicking the current upload speed being shown at the bottom right of Azureus
The Swarm average speed displayed there is the added up Average Swarm Speed of the torrents that are downloading right now.
If you are already using Good settings and also Good torrents you should virtually always be able to download faster than the Swarm average (like shown in the example screenshot). This should also be the case even if you are seeding while downloading, at least if you are uploading at least as much as the Average Swarm Speed is.
In "My Torrents"
If you want to compare it for single torrents, you could easily enable the Average Swarm Speed column: just go to the "My Torrents" tab, right-click where the downloading torrents are queued and choose "Column setup". "Enable" the column called Swarm Average Speed there and hit "OK".
From now on you'll see the Average Swarm Speed - the average download speed of the peers in the swarm. If that speed is very low (<5 kb/s) it's unlikely that you are able to download that torrent very fast. The Total Speed of the torrent is not so important. Also, using Force Start will not help you!
When you are downloading good torrents and have good Azureus settings you should be able to get something between one and eight times the Average Swarm Speed - it's also partly depending on your upload speed to the swarm. If you only upload 5 kb/s don't expect to be able to get 50 kb/s back. Remember: this is file-sharing, not file-downloading.
How is it calculated?
The average swarm speed is calculated by measuring the interval between have-messages and the amount of data they represent you get from your peers (the estimated download speed column in the peers view is based on that information, too). Then the calculated peer speed (including your own) is divided by the number of peers you're connected to.
Please note that this is just a rough estimate and not very precise for torrents with large piece sizes or when you're only connected to few peers.
Read the Azureus FAQ