Optimizing Heightmap

glBindTexture(GL_TEXTURE_2D, groundTexture);
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	for (int z = 0; z < Size - 1; z++)
	{
		glBegin(GL_TRIANGLE_STRIP);
		for (int x = 0; x < Size; x++)
		{
			// render two vertices of the strip at once
			float scaledHeight = heightmap[z * Size + x] / ScaleFactor;
			float nextScaledHeight = heightmap[(z + 1)* Size + x] / ScaleFactor;
			float color = 0.5f + 0.5f * scaledHeight / MaxHeight;
			float nextColor = 0.5f + 0.5f * nextScaledHeight / MaxHeight;

			glColor3f(color, color, color);
			glTexCoord2f((GLfloat)x/Size*8, (GLfloat)z/Size*8);
			glVertex3f(static_cast<GLfloat>(x - Size/2), scaledHeight, static_cast<GLfloat>(z - Size/2));

			glColor3f(nextColor, nextColor, nextColor);
			glTexCoord2f((GLfloat)x/Size*8, (GLfloat)(z+1)/Size*8);
			glVertex3f(static_cast<GLfloat>(x - Size/2), nextScaledHeight, static_cast<GLfloat>(z + 1 - Size/2));
		}
		glEnd();
	}