When I activate Deferred Technical Preview my device screen goes black and lags badly around 4 FPS

I want my gaming experience to be more calm and add features from the Deferred Technical Preview feature such as shadows, fog, water movement, light reflections and others. With this I am sure that Android and iOS players will not mind activating the Deferred Technical Preview feature. I hope this case is resolved quickly. Please fix it, Mojang Studios.