In the statistics tab i find
Overall Download Rate: 622 kB/s [MAX:Unlimited] Max Connection Limits: 50 per task
How can i change the value of Max Connection Limits, or this number derived from my connection bandwidth ?
Options–>Advanced settings.
bittorrent.max_connections_per_task default is 0-auto(50) set it to whatever works for your connection. If you encounter problems with your connection set it to a lower value.