Image::Magick GIF Animation Speed

[~~David~~]

All, I am making an animated GIF, and want to be better able to control the speed at which it loops. Is there a setting somewhere that can accomplish this? Or do I have to make a 4 file loop with the first 2 and last 2 images being the same to slow down the apparent blink rate?

sub makeGIF {
    my $desktop = "C:\\Documents and Settings\\$ENV{LNAME}\\Desktop\\"
+;
    my($blinker);
    $blinker = new Image::Magick;
    $blinker->Read("TempImages\\defective.bmp");
    $blinker->Read("TempImages\\reference.bmp");
    $blinker->Write("$desktop\\blink.gif");
}