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  • You could try using a higher baudrate, instead of just 9600. Commented Mar 9, 2018 at 14:48
  • Possible explanation for the lag. Since serial data is being buffered; if you send data faster, than the serial connection can handle, you'd get lag. As the latest data has to wait in line to be send. Using a tiny delay, or better Serial.flush(), or Majenko's #3 suggestion would eliminate the lag caused by buffering. Commented Mar 9, 2018 at 15:00
  • NewPing right(9,6,100); NewPing left(7,5,100); Is the 100 the timeout for no return? Can you make that shorter? Commented Mar 9, 2018 at 15:30
  • its maximum distance ,100cm Commented Mar 9, 2018 at 15:58
  • Don't edit the question and invalidate an existing answer. Commented Mar 9, 2018 at 16:05