Faster version with 32-bit fixed point math (at some point it's INCREDIBLY fast) on the same PIC32 running on 57 MHz CPU freq, but obviously less precise - error level doesn't allow to travel deep into the Set and it goes off the track too soon:

The same source code: https://gitlab.com/shaos/xorlib/blob/master/examples/mandelbr.c

But with FIXED32 macro instead of FIXED64 and "fake wide-screen" ratio 16:9 (with the same resolution 160x200)...