Someone figured out a registry edit that helped my Teclast X80 Pro wifi (Realtek) quite a bit.
Find the item named “bLeisurePs” in:
HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Class \ {4D36E972-E325-11CE-BFC1-08002bE10318} \ 0001
Change the value from 2 to 0.
Either disable and re-enable the wifi adapter or reboot. Should see a big difference in adapter behavior as I did.
Probably works for any tablet with Realtek wifi.