Custom D.E.O.T. V2.0+/Clockwork OS v0.5 image - With customised DEOT interface, Kernel 5.7, Optional 1400MHz OC, Debian 10 Buster, Retroarch 1.9.0, Mupen64+ plus more! (Current build: 200903)

by any luck could you try arch os image ? it have the dclock patch we suspect is a need for screen flickering issue.

also for your second question the arch dedicated launcher got < cpu mhz / enabled cpu cores / cpu governor > current visualization and you could change them at runtime.

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