Is this a bug? I have only two sliders on homepage (and yesterday I installed your latest theme update), and when I load it or refresh it both slider images appear stacked one on top of the other for a second before it resolves into just the first slider image. This does not look good at all. This behavior happens using both Chrome and Firefox. Is there a fix for this? Or can you fix this for next update please?
May be your site has some heavy sized image that is why it is taking some considerable time for a jquery to convert the stacked images into slider. But for other website, they must be using small size image hence taking quick time.
Try using the below CSS using some custom CSS plugin. It should fix your issue