I been watching movies from bigU Movies app on both 3G network and WiFi with no problems whatsoever. @bab2010 you may need to get a new router or upgrade to a high speed internet plan with your ISP if your WiFi is slow and your WiFI connection sucks.
Here is what i get most of the time on wifi, i don't know if it should be enough but truth is that it suck, check the first top result
and my carrier doesn't have 3g so... Here is what i have on my edge connection, it's not today's test but anyway the result is always the same so check the first top result
Tell me if i should be able to watch bigU with these connection speed then i will think something wrong with my phone.
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m8, i installed an app through cydia called mywi . it tricks your phone into thinkin its on wifi wen its on 3g . i have no problems watchin films with that