Mais rapidez na leitura de arquivo binário

InputStream arqBin = new FileInputStream(fileName);
	   
 DataInputStream lerByte = new DataInputStream(arqBin);
		   
 String[] ss = null;
          
              while(( _flt = lerByte.readInt()) != -1){
		    	
		    	if(h == 0) {
                            lerByte.readByte();
                            ss[] = new String[81];
                            ss[0] = "True";
                        }
                        h++;

                        _flt = ( (_flt >>> 24 & 0x000000FF)   
			               | (_flt >>>  8 & 0x0000FF00)   
			               | (_flt <<   8 & 0x00FF0000)   
			               | (_flt <<  24 & 0xFF000000));  
		    	float flt = Float.intBitsToFloat(_flt);


                        ss[h] = ""+flt;

                       if(h == 80){
		    		model.addRow(ss);
                                h=0;
                        }
                          

                        
              }