ok guys im startting to loose it, i have been streaming with my ps3 and PMS for years now and never really had a problem. i run an external HD to my PC (where i store all my back ups

) then PC to router and WIRED to PS3. i usually play HD movies with out any problem but now i have began to get some 3d blu rays, file size varies from 4gb to 16gb, and i can not get it to run smoothly at all??
i have moved the files direct to my pc so not to run it from the external HD but still have this problem, i guess i just want to know is it my pc or ps3?? thanks guys
any help would be appreciated