This was never a problem for me before and suddenly became a big issue. Download is 15 mbp and upload is 11 mbp. On LTE youtube loads just fine unless the connection is bad but normally it's fine with even just 1-2 bars LTE. On wifi, videos take up to 30 seconds to open, 10 seconds before playing at all and load probably a second of video every three settings. This only became a problem recently, and I've tried turning data off while watching videos which is supposed to fix it and it does nothing. On the ipad youtube loads just fine if i put the ipad next to the phone and try loading a video on rach. The iphone takes FOREVER, and stutters and buffers, while the ipad loads fine without much buffer.