Historically, and for various reasons, there is an opinion that this type of Courante should never be played fast. However, if the tempo becomes slow and the trills heavy, it can hardly be called a fluent performance. Regardless of various historical contexts, even if Bach conceived of a slow Courante, performing it on a modern piano necessitates leveraging the instrument's unique characteristics to make the performance meaningful.  

It is crucial to play with a fast tempo, light trills, and a rhythmic, unfussy approach. When transitioning from the first half to the second half, count carefully to ensure a timely entry.  

Be careful not to let the dynamics become flat. While dynamics can be varied through sequences, also try changing the 'color' according to the key.