Use a rs485 communication module

@Gordon

timing test

  t = getTime();
  g.setFontDennis8();
  g.drawString(texte,compteur,0);
  console.log("Draw took ",getTime()-t);

1v92 FIRMWARE
with custom font like setFontDennis8 : 0,244
with custom font simplified : 0,239
with custom font like setFontDennis8 + E.toString() : 0,154
with custom font simplifed + E.toString() : 0,155

1v92 CUSTOM FIRMWARE
with custom font like setFontDennis8 : 0,106
with custom font simplified : 0,106
with custom font like setFontDennis8+ E.toString(atob) + : 0,094
with custom font simplified + E.toString(): 0,094

therefor best result with:
. custom firmware
. E.toString()
. nothing more with simplified font (only usefull char design)