I noticed that 1Sheeld library is notably large especially in terms of memory when you are using Arduino uno R3.I decided to use custom settings but unfortunately the command does not seem to be working as the taken memory is still the same.I just wanted to use the test to speech command.Below is a snippet of the code,the custom part.
//Parallax RFID Reader
#define RFIDEnablePin 2 //Pin that enables reading. Set as OUTPUT and LOW to read an RFID tag
#define RFIDSerialRate 2400 //Parallax RFID Reader Serial Port Speed
//Using SoftwareSerial Library to locate the serial pins off the default set
//This allows the Arduino to be updated via USB with no conflict
#define RxPin 5 //Pin to read data from Reader
#define TxPin 4 //Pin to write data to the Reader NOTE: The reader doesn't get written to, don't connect this line.
StringRFIDTAG="";//Holds the RFID Code read from a tag
StringDisplayTAG="";//Holds the last displayed RFID Tag