Capacitive Sensor Slow

Hi

I am programming with Capacitive Sensor Library Solution, but when is showing the sensor capacitive values on serial terminal is slow. Why ?

#include <CapacitiveSensor.h>

CapacitiveSensor   cs_4_2 = CapacitiveSensor(4,2);        // 10M resistor  between pins 4 & 2, pin 2 is sensor pin, add a wire and or foil if desired
CapacitiveSensor   cs_4_6 = CapacitiveSensor(4,6);        // 10M resistor between pins 4 & 6, pin 6 is sensor pin, add a wire and or foil
CapacitiveSensor   cs_4_8 = CapacitiveSensor(4,8);        // 10M resistor between pins 4 & 8, pin 8 is sensor pin, add a wire and or foil

void setup()                    
{
   cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);     // turn off autocalibrate on channel 1 - just as an example
   Serial.begin(9600);
}

void loop()                    
{
  long start = millis();
  long total1 =  cs_4_2.capacitiveSensor(30);
  long total2 =  cs_4_6.capacitiveSensor(30);
  long total3 =  cs_4_8.capacitiveSensor(30);

  Serial.print(millis() - start);        // check on performance in milliseconds
  Serial.print("\t");                    // tab character for debug windown spacing

  Serial.print(total1);                  // print sensor output 1
  Serial.print("\t");
  Serial.print(total2);                  // print sensor output 2
  Serial.print("\t");
  Serial.println(total3);                // print sensor output 3

  delay(10);                             // arbitrary delay to limit data to serial port 
}

Thank you

Hello
What capacitive sensor are you using ?