Nikon 810a compatibility

Hi Rick!
I own a D810a & a Tak 106. Never used the setup together though (yet). But I can give it a go when the skies are clear over here....
I tried SGP with a Star 71 (aprox 350 mm.), a SGL focusser & the D810a, but autofocus was slow. Only tried this once, but because it was a vacation at the southern hemisphere, I skipped the autofocus to save time. I also used a cheap tablet with win10. That doesn't help........
But as said, I'll try this week on the Tak ( with robofocus ) to find out.
Marco