Performance hit settig grid row color

I use the following code to update the row color in a grid, it works fine but when many rows are returned there is a performance penalty.

for(var i=0;i<G1.getRowCount();i++){
G1.getRowTemplate(i).setStyle("background-color", function(){
return this.getRowProperty("Mybackcolor");
});
}

Is there a better way to update the row template without having to skip through the entire data set?

Thanks,

Yes, you can apply the style to the row template without index -

G1.getRowTemplate().setStyle("background-color", function(){
return this.getRowProperty("Mybackcolor");
});