[Plugin: Smoothness Slider Shortcode] Transparency issues

Hello,

I am experiencing difficulty with the slider code (which I think is nivo-slider?), when the images cycle there is a period of about one second where the previous photo is shown beneath the next one, which wouldn’t be a problem, only my slider relies heavily on images with large blocks of transparency where the page background should show beneath and not he previous picture.

Does anyone know how I can prevent this from happening, or reduce the time that the previous photo is displayed for, so that this is less noticeable?

Thanks,
Jeremy

http://ww.wp.xz.cn/extend/plugins/smoothness-slider-shortcode/