Miracast function is a (bad) joke!

The mirroring of the display, so the Miracast mode, with my Sony Xperia Tablet Z absolutely useless, occur constantly artifacts and violent jerks due to low frame on! Apart from this, the response time is too slow, Games are therefore unplayable because the delay is far too high! Another major drawback is that no internet connection to your tablet is no longer possible when mirrored in Miracast MODE, despite integration of home wireless network! (However, this problem is probably mainly occur with the Internet connection at Tablet Z if this is also the case with other devices, I can not judge so!)
Conclusion: so not or only partially usable for Miracast, will make use of my right of withdrawal, the thing to send back and wait for something better! Possibly is indeed the new dongle from Asus 90XB01F0-BEX000 better or faster, which supports at least also dual WLAN, but it costs currently unfortunately still more than double, as to the 90, - Euro.