Arduino IDE 1.0.5 + Arduino UNO + Adafruit 1.8" TFT Shield -> hang up after 1s / Solved! run well without uSD card

TFT_randomline2.ino

/*
  TFT demo
  https://github.com/arduino/TFT
  http://arduino.cc/en/Reference/TFTLibrary
*/

// randomdot

#include <TFT.h>
#include <SPI.h>

#define TFT_CS  10
#define TFT_DC   8
#define TFT_RST  0
#define TFT_SCLK  13
#define TFT_MOSI  11
#define SD_CS  4

TFT screen = TFT(TFT_CS, TFT_DC, TFT_RST);  // for UNO
/// TFT screen = TFT(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);  // for Leonardo

void setup(void) {
    Serial.begin(9600);
    while(!Serial);
    Serial.println("START");

  screen.begin();
  SPI.setClockDivider(SPI_CLOCK_DIV16);  // SPI speed
  screen.background(0,0,0);
  screen.fill(255,255,255);
    
}

const int XMAX=ST7735_TFTHEIGHT;
const int YMAX=ST7735_TFTWIDTH;

unsigned long counter=0;

void loop() {
  int x1,y1,x2,y2,r,g,b;
  unsigned long stime,etime;
  
  stime=millis();
  for(int i=1;i<=1000;i++) {
    r=random(256); g=random(256); b=random(256);
    x1=random(0,XMAX);
    y1=random(0,YMAX);
    x2=random(0,XMAX);
    y2=random(0,YMAX);
    screen.stroke(r,g,b);
    screen.line(x1,y1,x2,y2); // line ... hang 01m02s
///    screen.line(x1,y1,x1,y2); // verticalline ... hang 01m05s
///    screen.line(x1,y1,x2,y1); // horizonalline ... hang 02m56s
///    screen.point(x1,y1); // dot ... hang
///    delay(10); // ... hang

  }
  etime=millis();
  counter++;
  Serial.println(counter);
}