smoothing pot input

Using Arduino Programming Questions
9

This seems to work, but is very slow to respond. How can I speed up the response?

float smooth ;


void loop() 
{
SSerial.print(analogRead(5));  //show raw output of pot value
SSerial.print(" ");                  // add a space for readibility

smooth = 0.9 * smooth + 0.1 * analogRead(5);  
SSerial_println(smooth);  //show filtered output of pot value

delay (100);
}