performance tips for computations on an ESP32

It is nrf52840 dongle, enabled neopixel in the build and the source and it still works

let run=true;
  function handleNextFrame () {
 let d1,d2,d3,d = Date();
 computeDiffusion();d1=Date().ms-d.ms;d=D­ate();
  computeHeating();d2=Date().ms-d.ms;d=Dat­e();
  prepareDisplay();d3=Date().ms-d.ms;d=Dat­e();
  print(d1,d2,d3);
  /**** show display ****/
    Neopixel.write(D11,Display);
  /**** wait for next frame and proceed ****/
    if (run) setTimeout(handleNextFrame,10);
  }
/**** start automatically ****/
  setTimeout(handleNextFrame,1000);   

output

  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v10.215 (c) 2021 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
98.876953125 4.97436523437 246.00219726562
99.18212890625 4.69970703125 245.45288085937
99.21264648437 4.97436523437 245.94116210937
99.39575195312 5.09643554687 246.12426757812
99.27368164062 5.18798828125 246.03271484375
99.42626953125 5.126953125 245.7275390625
99.67041015625 4.66918945312 246.00219726562
99.57885742187 4.73022460937 245.69702148437
99.51782226562 4.85229492187 246.7041015625
99.30419921875 4.82177734375 245.33081054687
99.76196289062 4.66918945312 246.42944335937
99.79248046875 4.66918945312 246.2158203125
99.70092773437 4.94384765625 247.16186523437
99.63989257812 4.54711914062 246.64306640625
99.7314453125 4.97436523437 246.39892578125
99.853515625 4.7607421875 246.09375
99.609375 4.85229492187 245.57495117187
99.82299804687 4.91333007812 246.06323242187
100.03662109375 5.06591796875 245.45288085937
100.341796875 4.66918945312 246.61254882812
100.00610351562 4.73022460937 246.18530273437
100.03662109375 4.79125976562 246.36840820312
100.12817382812 4.60815429687 245.33081054687
100.31127929687 4.8828125 245.7275390625
100.2197265625 5.06591796875 245.94116210937
100.28076171875 4.85229492187 246.79565429687
100.28076171875 4.91333007812 246.15478515625
100.37231445312 4.85229492187 246.18530273437
100.4638671875 5.09643554687 246.00219726562
100.61645507812 5.03540039062 245.849609375
100.55541992187 5.15747070312 245.60546875
100.79956054687 4.91333007812 246.06323242187
100.64697265625 5.126953125 245.78857421875
100.61645507812 4.638671875 245.26977539062
100.64697265625 4.66918945312 245.63598632812
100.52490234375 5.09643554687 246.49047851562
101.07421875 4.97436523437 247.22290039062
100.4638671875 4.638671875 245.94116210937
100.76904296875 5.03540039062 246.97875976562
100.64697265625 5.27954101562 246.24633789062
>run=false
=false
100.64697265625 5.06591796875 245.39184570312
>