In connection tab you must select the speed of your Internet connection. That is necessary for the optimal use of your bandwidth. Try to avoid setting "Max Connection Number" to values greater than four. Large number of connections (file segments) can deteriorate file transfer performance and may result in higher resource usage on the server you are downloading from. This may lead to some limits or other protective measures from local system administrators. On the other side, larger number of connections can increase the speed very significantly if you have a cable modem or a highly utilized (shared) Internet connection.
You can set individual numbers of connections (numbers of threads to download) for the servers in Exceptions table. You may need it for the servers that limit the number of connections from the same client. This is also useful for ftp servers that limit the number of connections to 1 or 2.
If you want to set download quotas on the usage of your Internet connection, you should set IDM Download Limits. It's useful for links that have some kind of fair access policy (like Direcway, Direct PC, Hughes, etc.). Let's say you set 40MB/hour or not more than 150MB every 4 hours, and IDM will download the maximum it can, and then resume automatically at a later time. This way you can download large files at the maximum possible speed
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