There are many Internet Booster or optimizer available on market which said they will increase your internet speed and something like that.first of all I will clear that internet speed mainly based on given below things-
1- You Network Signal
2-ISP(Internet Service Provider)
3-Climate condition(like in raining day net get slow)
4-Your system RAM and space.
3-Your system performance.
So after that there are some network in built in your system for giving better network and internet performance which you can do manual or by downloading any software which are these Internet Booster do .They do which you do wanted to manually which tweaks internet speed little more.Internet booster will not increase you internet speed 3x or 4x time, it just push it little buy removing background apps which taking system RAM and processing without know of User.
This all which these software do.
You can do ot yourself or you can take their help but they also have more adds which frustrate the user .
So overall that app is average .