P3 RGB pixel panel

hmm, there must be something different in our testing.
To compare Original Espruino Board with ESP32 I wrote some Q&U functions (quick and ugly)
As a first result I couldn't find any way to come down to 20ms, as you mentioned.
Strange results, in my eyes, are:

• setting a pin is 3 times slower on ESP32
  
• to figure out how much time goes to ESP-IDF, a simple test function is added to Source, which calls jshPinSetValue with true and with false. This takes a few ms only.
  
• array copy from a big array already takes much more than 20 ms
  
• LedShiftout which is similiar to the command in your module takes even more time
  

• if setting a pin only takes some microsecs, why does setting with pin.set() take close to a millisec

  var pin;
  switch(process.env.BOARD){
  case "ESPRUINOBOARD": pin = B5; break;
  case "ESP32": pin = D5; break;
  }
  function test(fnc){
  var t = new Date();
  eval(fnc);
  console.log(fnc.substr(3), ":" ,parseInt(new Date() -t));
  }
  function tstLoop(cnt){
  for(var i = 0; i < cnt; i++){}
  }
  function tstArr(cnt){
  var o;for(var i = 0; i < cnt; i++){o = new Uint8Array(1024);}
  }
  function tstPin(cnt){
  for(var i = 0; i < cnt; i++){pin.set();}
  }
  function tstArrCopy(cnt){
  var c,o = new Uint8Array(1024);
  for(var i = 0; i < cnt; i += 4){
  c = new Uint8Array(o,i,64);
  }
  }
  function tstDigitalWrite(cnt){
  var dfnc = digitalWrite.bind(null,[pin,pin,pin,pin,­pin,pin,pin]);
  for(i = 0; i < cnt; i++){
  dfnc(33);
  }
  }
  function tstShiftOut(cnt){
  var arr = new Uint8Array(64);
  var sfnc = shiftOut.bind(null,[pin,pin,pin,pin,pin,­pin],{clk:pin});
  for(var i = 0; i < cnt; i++){
  sfnc(arr);
  }
  }
  function tstLedShiftOut(cnt){
  var arr = new Uint8Array(1024);
  var sfnc = shiftOut.bind(null,[pin,pin,pin,pin,pin,­pin],{clk:pin});
  for(var i = 0; i < cnt; i++){
  sfnc(new Uint8Array(arr,i*64,64));
  }
  }
  function tstjshPinSetValue(cnt){
  ESP32.test(pin,cnt);
  }
  test("tstLoop(1000)");
  test("tstArr(100)");
  test("tstPin(1000)");
  test("tstArrCopy(16)");
  test("tstShiftOut(16)");
  test("tstLedShiftOut(16)");
  test("tstDigitalWrite(16)");
  switch(process.env.BOARD){
  case "ESP32": test("tstjshPinSetValue(6144)"); break;
  }
  

Result in Millisconds of running test on both boards