[AS2] Lag on key press

programming
1

[COLOR=#333233]Hi guys. I’m working on a game in AS 2, but have encountered a problem - the game gets steadily more laggy as you progress through the levels, but the lag only occurs when a key is pressed (usually frequent presses or keys being held down - in particular, the arrow keys to move the player).[/COLOR]
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[COLOR=#333233]To move the player:

[/COLOR]

[COLOR=#333233]if(keyup == true && keyleft == false && keyright == false && keydown == false) {[/COLOR]
[COLOR=#333233]                    _root.hero._y -= moveup;[/COLOR]

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And I’m using a function to determine key down:[/COLOR]
[COLOR=#333233]
[/COLOR]

[COLOR=#333233]keyListener.onKeyDown = function() {[/COLOR]
[COLOR=#333233]if (keyisdownvar(keyupdown) && !keyisdownvar(keyleftdown) && !keyisdownvar(keyrightdown) && !keyisdownvar(keydowndown)) {[/COLOR]
[COLOR=#333233]                    keyup = true;[/COLOR]
[COLOR=#333233]                    keyleft = false;[/COLOR]
[COLOR=#333233]                    keydown = false;[/COLOR]
[COLOR=#333233]                    keyright = false;[/COLOR]
}
[COLOR=#333233]                }[/COLOR]

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There’s nothing wrong with the code per se - I was just wondering if there is a more efficient way of doing this that will work better towards reducing lag?

Thanks guys.[/COLOR]