SFML 2.0 RC : Event blocks the app for ~250ms

#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>

using namespace sf;

int main(int argc, char** argv[])
{
    RenderWindow window(sf::VideoMode(800, 600), "Event blocking");
    window.setFramerateLimit(60);

    Texture bgTex;
    bgTex.loadFromFile("background.png");

    RectangleShape bgRect;
    bgRect.setTexture(&bgTex);
    bgRect.setPosition(0, 0);

    Event evt;

    while (window.isOpen())
    {
        while (window.pollEvent(evt))
        {
            if(evt.type == Event::MouseMoved)
                bgRect.setSize(Vector2f(Mouse::getPosition().x, Mouse::getPosition().y));
        }

        window.clear();
        window.draw(bgRect);
        window.display();
    }

    return EXIT_SUCCESS;
}