First, mIRC's a chat program as pointed out in the sticky and we can't offer much help on the topic of filesharing as 95%+ is illegal, even if yours isn't.
Second, the server may have limited the current download speeds, or may be sending to others and that limits the speeds because you share the total speed that user can send at, or you may have a lot of traffic on your ADSL line that is slowing you down. There are some other possibilities as well and there is little you can do to fix the problem without changing ISPs or using other fservs. DCC, quite simply, is one of the worst protocols for filesharing. You can almost always download faster through just about any other protocol.
