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why FTGL slows down when I use colors?

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I use FTGL to render fonts in my OpenGL/SDL game. Here is my printing function:
void show_text(FTGLPixmapFont& font,int score)
char temp[32];

sprintf(temp, "%d", score); // conver score to a char*




I call this everytime I refresh the screen , just like the rest of the parts of my game are repainted. It works fine. But when I change glColor4f(1.0,1.0,1.0,1.0); to glColor4f(1.0,1.0,0.5,1.0); the game gets much much slower. Why is this happening?

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