Server: PageSpeed module installed - GTMetrix
If you have PageSpeed module installed on your server, and your GTMetrix pagetest shows you an error about "Serve resources from a consistent URL" because of some duplicated content, then here's what you should do.
Open up your Pagespeed.conf file, and add this line:
Which will exclude every jpg images from your /your-image-folder/slider-images-folder/ resolving the problem.
Of course, you can exclude exact images, if needed, like this:
ModPagespeedDisallow "http://yoursite.com/your-image-folder/slider-images-folder/my-slider-image.jpg" ModPagespeedDisallow "http://yoursite.com/folder/img/img2.png" ModPagespeedDisallow "http://yoursite.com/images/picture.jpg"
Which will exclude my-slider-image.jpg, img.png and picture.jpg from the set folders.