Imagine a thread with 100 image attachments, when a user loads the page, these images generate 100x6 = 600 queries in my DB servers (in full-size image mode). This's crazy! This addon reduces the usual 6 queries per image to 1 per image, resulting in 83% less queries for busy, images-focused websites. Images will also be cached in client browsers to improve performance further. WHAT DOES IT DO? Force image attachments work with Guest permission (Guests can view full image attachments without login logged in permission). Decrease to minimum queries for Image Attachment Display, in our test, we can save from 6 to 1 query per an image (in case of guests or logged in users without "Remember option"). Add caching headers to images. Browsers won't load these images again if the same page reloaded. (New) Support CDN for attachment images. You can serve these images via CloudFront, MaxCDN or other CDN services. To have all benefits of using this add-on, you should turn on Xenforo Caching feature for your forum (memcached, xcache,...).