better app than duet display

I use duet display current from windows to ipad and use Wacom as drawing tablet. the duet display is good but it lags only feeding 60fps anything faster and better? I tried spacedesk and xdisplay already

I know this response is almost 2 years later but, wanted to mention AstroPad. It works very well and the lag is hardly noticeable. It’s subscription model which is the only downside, but worth it if you use it often.