When I scroll some litlle div with many elements, my mouse scrolling is too fast so I can\'t see few elements.
Scroll speed can't be altered as they are System configurations and Javascript shouldn't be allowed to alter a user's own settings.
But there are a lot of jquery custom scrollbars that you can use, which offer an option to change the scroll speed. Examples: mCustomScrollbar, jquery slimscroll etc
You can use NiceScroll plugin with jQuery:
$(document).ready(function() {
$("html").niceScroll();
}
);
Or jQuery.scrollSpeed plugin.