I have been having enormous trouble with sharing both powerpoint slides and videos on my screen, despite having a 850Mbs connection. Videos and Powerpoint slide transitions or animations are very choppy, all over a delay some 2 seconds between my actions (eg. pressing a play button, or clicking from one slide to another) and the result participants actually see. 

Is there any way to improve this? While I am happy to accept a 1280 × 720 resolution over 4K or even full HD resolution, I really need the frame rate to be at least a proper 25fps if not higher so that my fade transitions (for slides) and movements (for videos) are decently smooth. Right now everything is both blurry and choppy.

What can I do to achieve this or something better?