put 

--disable-security-limits

in the filters section of your project, and then go to limits or flow control
and set the max speed to 99999999

That will allow you to pretty much max out your connection, if the site you're
trying to copy can handle that. You can also increase the number of
simultaneous connections. BUt be careful. It's considered bad to hammer a
website with tons of connections. 3 or 4 should be sufficient.