[CA] eS75 Sluggish User Interface Response (Locally and RayControl)

My eS75 feels sluggish and unresponsive in use, especially with charts displayed. Are there any system performance diagnostic tests I should be looking to run?

As a secondary question, the response on my iPAD using the RayControl app is extremely laggy, switching between screens is slow etc. The iPAD is not new - model MD785 (16GB) and I think a 1.4GHz processor. Is there a way to get better RayControl performance?

thanks
W