Oh, I see now where this is from: https://developers.google.com/speed/docs/insights/OptimizeCSSDelivery https://developers.google.com/speed/docs/insights/Optimi

Oh, I see now where this is from: https://developers.google.com/speed/docs/insights/OptimizeCSSDelivery https://developers.google.com/speed/docs/insights/OptimizeCS... That's quite an ugly optimization step. You left out the step where you inline the necessary CSS styles in the head that's why the unstyled page flashes up for a second. But as you use bootstrap, this might be a lot to inline and not worth the effort. I'd say this is a case where you shouldn't care too much about a highscore :-)