If color format will affect page render speed? Chrome will auto convert hex color to rgba format. I'm confused about if I should do like this. Or use conditional classes to implement graceful degradation about color format.

gistfile1.css

@charset "utf-8";

.blueBoxGradient {
	
	/* Old Browsers */
	
	background: #8a9aab;
	
	background: rgb(138,154,171);
	
	
	
	background: url(data:image/svg+xml;base64,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); /* IE9 SVG, needs conditional override of 'filter' to 'none' */
	
	
	
	/* FF3.6+ */
	
	background: -moz-linear-gradient(top, hsla(211,16%,61%,1) 0%, hsla(212,34%,33%,1) 100%);
	
	background: -moz-linear-gradient(top, hsl(211,16%,61%) 0%, hsl(212,34%,33%) 100%);
	
	background: -moz-linear-gradient(top, rgba(138,154,171,1) 0%, rgba(56,83,113,1) 100%);
	
	background: -moz-linear-gradient(top, rgb(138,154,171) 0%, rgb(56,83,113) 100%);
	
	background: -moz-linear-gradient(top, #8a9aab 0%, #385371 100%);
	
	
	
	/* Chrome, Safari4+ */
	
	background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,hsla(211,16%,61%,1)), color-stop(100%,hsla(212,34%,33%,1)));
	
	background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,hsl(211,16%,61%)), color-stop(100%,hsl(212,34%,33%)));
	
	background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(138,154,171,1)), color-stop(100%,rgba(56,83,113,1)));
	
	background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgb(138,154,171)), color-stop(100%,rgb(56,83,113)));
	
	background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#8a9aab), color-stop(100%,#385371));
	
	
	
	/* Chrome10+, Safari5.1+ */
	
	background: -webkit-linear-gradient(top, hsla(211,16%,61%,1) 0%,hsla(212,34%,33%,1) 100%);
	
	background: -webkit-linear-gradient(top, hsl(211,16%,61%) 0%,hsl(212,34%,33%) 100%);
	
	background: -webkit-linear-gradient(top, rgba(138,154,171,1) 0%,rgba(56,83,113,1) 100%);
	
	background: -webkit-linear-gradient(top, rgb(138,154,171) 0%,rgb(56,83,113) 100%);
	
	background: -webkit-linear-gradient(top, #8a9aab 0%,#385371 100%);
	
	
	
	/* Opera 11.10+ */
	
	background: -o-linear-gradient(top, hsla(211,16%,61%,1) 0%,hsla(212,34%,33%,1) 100%);
	
	background: -o-linear-gradient(top, hsl(211,16%,61%) 0%,hsl(212,34%,33%) 100%);
	
	background: -o-linear-gradient(top, rgba(138,154,171,1) 0%,rgba(56,83,113,1) 100%);
	
	background: -o-linear-gradient(top, rgb(138,154,171) 0%,rgb(56,83,113) 100%);
	
	background: -o-linear-gradient(top, #8a9aab 0%,#385371 100%);
	
	
	
	/* IE10+ */
	
	background: -ms-linear-gradient(top, hsla(211,16%,61%,1) 0%,hsla(212,34%,33%,1) 100%); 
	
	background: -ms-linear-gradient(top, hsl(211,16%,61%) 0%,hsl(212,34%,33%) 100%);
	
	background: -ms-linear-gradient(top, rgba(138,154,171,1) 0%,rgba(56,83,113,1) 100%);
	
	background: -ms-linear-gradient(top, rgb(138,154,171) 0%,rgb(56,83,113) 100%);
	
	background: -ms-linear-gradient(top, #8a9aab 0%,#385371 100%);
	
	
	
	/* W3C */
	
	background: linear-gradient(to bottom, hsla(211,16%,61%,1) 0%,hsla(212,34%,33%,1) 100%); 
	
	background: linear-gradient(to bottom, hsl(211,16%,61%) 0%,hsl(212,34%,33%) 100%);
	
	background: linear-gradient(to bottom, rgba(138,154,171,1) 0%,rgba(56,83,113,1) 100%);
	
	background: linear-gradient(to bottom, rgb(138,154,171) 0%,rgb(56,83,113) 100%);
	
	background: linear-gradient(to bottom, #8a9aab 0%,#385371 100%);
	
	
	/* IE6-8 */
	
	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#8a9aab', endColorstr='#385371', GradientType=0 );
	
}

/* Add a "gradientFilter" class to all elements that have a gradient, and add the following override to HTML to complete the IE9 support. */

.ie9 .gradientFilter {
	
	filter: none;
	
}