You can only download as fast as your connection allows, as fast as your sources will allow. People often upload to several people at once so keep that in mind their bandwith & slots are shared & can become full (which is why you sometimes can't connect to them.) Answer is to try to find more sources. Don't be shy to do another search. Also, right-click the search result tab & a small menu will appear, choose Get more results.

Some hosts like Shareaza (RAZA) use more than one network & are reknown as only offering miserly bandwidth for gnutella network users. They often have a good video selection.

See if your ISP is shaping your LW use. They can often detect p2p programs & if they have strict rules my shape LW or at various times of day. One way to check is do a test download from magnet link dot com: + MagnetMix.com +: The Source for Good Content
Tell us what happens & also tell us who your ISP is.