> I have the problem, that httrack is downloading with
> only around 20kb/sec. The field for the transfer
> rate in the option is empty so I thought this would
> be "use max speed", but I manually have to input a
> high number, so that I can download with the
> 300kb/sec I should be able to.

The default is 100kbs 5 connections/sec.  To exceed these limits you must also
disable the security limits.  This is to prevent overloading a server.

Your 20kbs is because httrack uses 1 connection for all html.
<http://forum.httrack.com/readmsg/18881/>