With rk3399-sd-friendlycore-lite-focal-5.10-arm64-20211202.img the system is very slow. kworker/0:0H-mmc_complete is using a lot of CPU vidmate.

I can´t get enabled the serial/tty i´m trying to connect an esp 8266 via rx/tx pins i´ve tried the following answers in dietpi https://testmyspeed.onl/ forums but no luck i´m stuck.