Maybe RedSDK, if your Native Draw is set to RedSDK Mode.
Look in Options/ Native Draw, and if it is go down and open Advanced and check all the box's there, except Double presision if it's inside that menubox.
Then you dont need to hit the F5 ( Redraw) button all the time.
V18, V19, V20, V21, 2015/ 16/ 17/ 18 Pro. Platinum
Deluxe V20, V21, 2015/ 16/ 17
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB