Side by side comparison of 3 and 4 on wifi revealed the 3 is consistently faster downloading and playing video clips. Although the 4 was just slightly faster with Web page download, the 3 was always faster, and significantly so, with any video clip I loaded. Very disappointed with this! I read somewhere the 4 works harder to run higher resolution screen. To me this is wasted, since in no way do I see the benefits of a higher resolution screen so far. Come on Samsung! You can't have a newer model underperform against a year old model. I would return it if it weren't the every so needed build quality.