Why is opera animation so slow?

问题

It seems as though opera doesn't play nice with multiple animations going on simultaneously, check out this theme I'm building. I've made a preloader which scatters the images outside body in random places then animates each of them into place in intervals of 0.1 seconds with the animation taking 0.8 seconds.

Here's the function I made:

function ea_preload_scatter() {

    if(item.length) {

        var scatter = $(window).height() + $(window).width();

        item.addClass('loading').each(function() {

            var positionX = ['','-'],
                positionY = ['','-'],
                x = Math.floor(Math.random()*2),
                y = Math.floor(Math.random()*2);

            if(positionX[x] === '-') {
                posX = -scatter;
            } else {
                posX = scatter;
            }

            if(positionY[y] === '-') {
                posY = -scatter;
            } else {
                posY = scatter;
            }                

            $('img', this).addClass('absolute').css('top',posX).css('left',posY);

        });

        $(window).load(function() {

            var i = 0,
                speed = 800;

            function ea_scatter_animate(e) {

                $('img',item.eq(e)).css({
                    zIndex: '10000'+e
                }).stop().animate({
                    top:0,
                    left:0
                }, speed, 'easeInOutExpo', function() {
                    $(this)
                        .removeClass('absolute')
                        .removeAttr('style')
                        .parent()
                        .removeClass('loading');
                });

                var t = setTimeout(function() {
                    if(e == item.length) {
                        clearTimeout(t);
                    } else {
                        ea_scatter_animate(i++);
                    }
                }, 100);

            }

            ea_scatter_animate(i);

        });

    }

}

Opera:

Version
11.51

Build
1087

Mac:

Platform
Mac OS X

System
10.6.8

Processor 
2.93 GHz Intel Core i7

Memory 
8GB 1333 MHz DDR3

So is there anything I can do to make this play nicely with Opera? Or is it just Opera being Opera?

来源：https://stackoverflow.com/questions/7460942/why-is-opera-animation-so-slow