Best setting for flycast on android shield tv

Hi, I would like to know if someone could help me to find the best settings in order to use propely flycast on android shield tv. For exemple, I test sonic adventure (PAL VERSION) and notice constant stuttering and game isn’t smooth.

I have already test redream and paid the premium version and sonic adventure is smooth and work good on shield tv. I really want to give a chance to flycast and lots people are enjoyed with it. so it would be nice if someone could point me on the whole best setting to apply for shield tv android version. (driver used, options use etc …) thanks for your help regards