Awrite! This is a very simple trick actually.
Does your phone take time to come to the home screen from any other screen? Is there a lag? I know that's minute, but sometimes when you need to come to your home page of your Samsung Galaxy phone from an app or apps page urgently, this immeasurably small amount of time can definitely raise your blood pressure.
So, why hotfoot your body to a hospital, when you can make your finger do wonders with your smart phone?! This small trick is for people with Samsung smartphones like S3, S4, S5, Note II, Note 3 and other Samsung phones with the app S Voice.
S Voice is an intelligent personal assistant and knowledge navigator which is only available as a built-in application for certain Samsung smartphones. The application uses a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Web services.
So back to the point. How to speed up your phone.
Go to apps page → click on the S Voice → go to settings → uncheck the 'Open via the home key' option.
Voila! You're done. Now your phone will definitely speed up. Check and enjoy!