My fixed background made scrolling the site very slow, what can I do to improve it?

Question

I changed the background of my discussion forum using the CSS below

http://forum.antinovaordemmundial.com

html {
    background: url(http://antinovaordemmundial.com/mystuff/logo_blog.jpg) no-repeat center center fixed;
    background-image: url(http://antinovaordemmundial.com/mystuff/logo_blog.jpg);
    background-repeat-x: no-repeat;
    background-repeat-y: no-repeat;
    background-attachment: fixed;
    background-position-x: 50%;
    background-position-y: 50%;
    background-origin: initial;
    background-clip: initial;
    background-color: initial;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

The image is 1600x711 and 88k. The scrolling of the pages are now very slow. Is the CSS problematic or the image should be smaller somehow?

Edit: I tried changing to:

body {        
    color: #000;
    font-family: Verdana, Arial, Sans-Serif;
    font-size: 13px;
    text-align: center; /* IE 5 fix */
    line-height: 1.4;
    background-attachment: fixed;
    background-clip: initial;
    background-color: #51010E;
    background-image: url(http://antinovaordemmundial.com/mystuff/logo_blog.jpg);
    background-origin: initial;
    background-position: initial initial;
    background-repeat: initial initial;
    margin-bottom: 0;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0;
    padding-bottom: 0;
    padding-left: 0;
    padding-right: 0;
    padding-top: 0;
}

But it is still very slow on scrolling.

Answer 1

I had the same problem and solved it using this jQuery plugin : http://srobbin.com/jquery-plugins/jquery-backstretch/

It doesn't use any CSS3 property but it works fine and doesn't have any performance issue on Chrome 13 or Firefox 6.