3G/4G Speed Optimizer

Inside the app settings you can choose three different options: the default mode, where downloads and uploads are on par; the quick download mode, which makes the uploads go a little slower; and the quick upload mode, which makes the downloads slow down a bit.

3G/4G Speed Optimizer is a pretty interesting app for users of a rooted device. That said, it's also very important to remember that the app consumes a lot of battery power.