That's governed by the local computer viewing the page. Animation is CPU and memory intensive. If you have a lot of other things going on, or even just one that takes up a lot of the resources of either, or the CPU is slow to begin with and/or there isn't much system memory, they will appear choppy. I often have lots of things going on, and right now is no exception, but the animations appear smooth here. However, if I had a slide show actively transitioning in another tab and PSP open with several large images open with many undo/redo actions stored, things would probably be choppy here as well.
One other possible factor is the internet connection, if the images aren't cached yet, resources devoted to downloading them on a slow connection may interfere with the animations.
The animations can be disabled by setting them to false in the lightbox.js file:
Code:
// -----------------------------------------------------------------------------------
//
// Configurationl
//
LightboxOptions = Object.extend({
fileLoadingImage: 'images/loading.gif',
fileBottomNavCloseImage: 'images/closelabel.gif',
overlayOpacity: 0.8, // controls transparency of shadow overlay
animate: false, // toggles resizing animations
resizeSpeed: 7, // controls the speed of the image resizing animations (1=slowest and 10=fastest)
borderSize: 10, //if you adjust the padding in the CSS, you will need to update this variable
// When grouping images this is used to write: Image # of #.
// Change it for non-english localization
labelImage: "Image",
labelOf: "of"
}, window.LightboxOptions || {});
// -----------------------------------------------------------------------------------
But I wouldn't recommend that in this case.
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