If you are having speed issues e.g. slow download speed, please also check out THIS troubleshooting guide!
A lot of people are asking this question. Download Speed is usually limited by two things:
JDownloader downloads as fast as possible. The maximum possible speed is of course the speed of your internet connection.
It is important to know, that most of the hosterĀ use a "Freemium" model. This means that the provide basic features for free, and premium features for money.
That's why the restrict their free service with for example limitations like this:
Some waittimes can be bypassed be using JDownloader's Reconnect System. Captchas can usually not be bypassed.
We cannot bypass the download limitations (e.g. speed-limits) either.
If you want full speed, the only way is to by the hosters Premiumservices. See here how to get an Account and how to use it.