I use JPEGmini Pro as LR plugin and it works well for me.
(Sadly, there's no way to buy the extension alone.) Bottom lin You can upload Hi-Res photos faster, save tons of hard drive space, improve customer viewing experience and make your website faster Get the smallest image file size without compromising quality or changing your workflow. When you export your photos directly from Lightroom, Photoshop and Capture One, they will automatically be optimized by JPEG Lightroom, Photoshop and Capture One Plug-ins Fits into your workflow. Launch Photoshop and choose: Window->Extensions->JPEG Home JPEGmini Pro Photoshop Plugin How to Activate JPEGmini Photoshop Extension on a P
