Pong game problem need some help!! ....

[RISCIT]

Hello


I encounter a problem with my code, When i push the button RB1 on my PIC16F887 TO make move the battle of my pong game while the ball move also, the screen is decrease in speed and the velocity become very weak, when i release it, everything is ok, but when i want to move the battle, it moving slowly even as the ball?


What is the problem on my code?

 {
       for(;;){

            // Deplacement_Balle();
            Raquette_Droite ();
            Raquette_Gauche ();
            Collision_Raquette();

        }

    }
}



void Fake_Loading()
{

    T6963C_write_text("LOADING", 4,2 , T6963C_ROM_MODE_OR);
    T6963C_box(10, 30, 118, 40, T6963C_WHITE);

}



void Menu()
{

    T6963C_rectangle(4, 4, 124, 60, T6963C_WHITE);
    T6963C_write_text(" Pong Game!", 2,2 , T6963C_ROM_MODE_OR);
    delay_ms(500);
    T6963C_write_text(" Design", 3,4 , T6963C_ROM_MODE_OR);
    T6963C_write_text("  ", 0,6 , T6963C_ROM_MODE_OR);

}



void  Raquette_Droite ()
{

    if(PORTB.F1==1)
    {

        x0=x0+3;
        x1=x1+3;
        T6963C_line(x0, 56, x1,56, T6963C_WHITE);
        T6963C_line(x0-3, 56, x1-3,56, T6963C_BLACK);

        if(x1>118)
        {
            x1=118;
            x0=96;
            T6963C_line(118, 56, 122,56, T6963C_BLACK);
            T6963C_line(96, 56, 118,56, T6963C_WHITE);
        }

        if(PORTB.F1==0)
        {

           T6963C_line(x0, 56, x1,56, T6963C_WHITE);

        }
    }
}



void  Raquette_Gauche ()
{


    if(PORTB.F2==1)
    {

        x0=x0-3;
        x1=x1-3;
        T6963C_line(x0, 56, x1,56, T6963C_WHITE);
        T6963C_line(x0+3, 56, x1+3,56, T6963C_BLACK);

        if(x0<10 && x1<122)
        {
            x1=32;
            x0=10;
            T6963C_line(10, 56, 32,56, T6963C_WHITE);
            T6963C_line(x0+3, 56, x1+3,56, T6963C_BLACK);
        }

        if(PORTB.F2==0)
        {

            T6963C_line(x0, 56, x1,56, T6963C_WHITE);

        }

    }
}



void Deplacement_Balle()
{

    T6963C_circle((int)x_c, (int)y_c, 2, T6963C_BLACK);
    x_c = x_c+ vx;
    y_c = y_c+ vy;
    delay_us(100);
    T6963C_circle((int)x_c, (int)y_c, 2, T6963C_WHITE);

    if(y_c > 58)
    {
        vy = -vy;
    }

    else if(y_c < 14)
    {
        Sound_Play(600, 10);
        vy = -vy;
    }

    else if(x_c <9)
    {
        Sound_Play(600, 10);
        vx = -vx;

    }

    else if(x_c > 117)
    {
        Sound_Play(600, 10);
        vx = -vx;

    }

}


void Collision_Raquette(){

 if(x_c >= x0 && x_c <= x1 && y_c >= 52)    vy = -vy;

 else  if(y_c >= 58)    {

 vx=0;
 vy=0;
 T6963C_circle((int)x_c, (int)y_c, 2, T6963C_BLACK);
 T6963C_panelFill(0);
 T6963C_write_text(" GAME OVER", 2,2 , T6963C_ROM_MODE_OR);


 }

}

thanks