The sprite is moving very slow and with bugs.

[DoubleNy]

Hi , I am trying to learn SFML, but all I've done is a skeleton of a game.
1. I created a sprite and added it to window.
2. I create a map(tiled map) and added it, too.
But, when i move my sprite it is very slow and has a lot of lags, i don't now why...or i do, I think this is caused because I draw my map and sprite always after moving sprite. How can I change this thing? 'cause if I remove draw.map, the sprite is very smooth and fast.

This is a part of my code :

while (window.isOpen()){
                // handle events
                sf::Event event;
                while (window.pollEvent(event)){
                        if (event.type == sf::Event::Closed)
                                window.close();
                }
                        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Up)) {
                                x = 68;
                                player.move(0.0, -20.0);
                        }
                        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Down)) {
                                x = 0;
                                player.move(0.0, 20.0);
                        }
                        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Left)) {
                                x = 3 * 70;
                                player.move(-20.0, 0.0);
                        }
                        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Right)) {
                                x = 2 * 68;
                                player.move(20.0, 0.0);
                        }
                //texture.loadFromFile("tank.png", sf::IntRect(x, 0, 80, 65));
                //changed to
               player.setTextureRect(sf::IntRect(x, 0, 79, 63));
                window.clear();
                window.draw(map);
                window.draw(player);
                window.display();
}
 

[G.]

Don't load textures inside your main loop, it's useless and slow. Load them only once before.

[DoubleNy]

even if I don't load texture in main loop the sprite is moving slow. Only if I erase "window.clear(); && window.draw(map);" it is moving smooth and fast, but in such case there remain parts of sprite in the back (smth like this : http://cdn2.theweek.co.uk/sites/theweek/files/styles/gallery_adv/public/2015/07/555.jpg?itok=Z4_O-uNe ). How can i draw only the part which will be fulfilled by sprite after his moving ?

[DarkRoku12]

You must use a delta time for control the movement.

[DoubleNy]

I have already read this part , but this doesn't work : (( 

[eXpl0it3r]

What GPU do you have?

[DoubleNy]

Mobile Intel(R) 45 Express Chipset Family(MSC - WDDM 1.1)

[sjaustirni]

Would you provide MCVE where you reproduce this problem so we don't have to guess where it went wrong?

[DoubleNy]

I think the problem is caused by drawing "window.draw(map);", because if i don't draw the map, and only draw the player inside loop, fps are like >1000, if they both are drawn fps don't exceed 18. I create the map as it is done in this tutorial http://www.sfml-dev.org/tutorials/2.4/graphics-vertex-array.php#example-tile-map.

[eXpl0it3r]

And how large is your map. But as has been said, without a compilable and minimal example all we can do is make random guesses.

Might add though, that your graphics card is rather old and not perform well even in simple scenarios. How many games can you run fluently on your PC?

[DoubleNy]

you can see the code on https://github.com/DoubleNy/Demokratie-bringer, it's not a bunch of code.
p.s look at game.cpp
p.p.s I don't play games,I've played only cs 1.6  3-4 years ago.