>>ISTR once you get it going, a PowerPoint presentation is just forward (and sometimes back). A skilled presenter can and would get used to advancing the screen a second before the next slide is actually needed.
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>>It would also enable those cases where it is physically not possible to run a cable from the presenter's device to the projector.
>
>I can send it to you if you want to try it. Here, it was a terrible disaster. I do not even know why this is being sold now.

Thanks, but no, I don't have any use case for something like that myself.

As you probably know I'm a great proponent of using wired connections where possible. But I like to keep abreast of new wireless technologies so I can recommend options for clients when wired connections aren't possible.

Googling [WiDi lag] brings up some interesting results. For example, if you also have a wireless router nearby, you might try changing the 2.4GHz channel(s) the router uses: http://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/wireless-display-adapter-lag-issues/2b348b24-bd64-4435-b25e-11b784da255d?auth=1