First, I did check out the 'Community" and documentation (CODEX) for a solution to this, but couldn't find it. And, did the google search as recommended in "The Good Support Ticket" tutorial. No help.
When we upload an image (picture) into a Wiki (we have a CMS), WP doesn't just create the 4 sizes (thumbnail, sml, med, large). If we have to change the size of the image, especially when grabbing a corner, side, top or bottom of it once it is uploaded, every time we change the picture size WP creates a new file. I checked out this plugin which was recommended in a post about almost the same issue, "Additional image sizes", but it doesn't deal with the issue of 10s of thousands of unwanted and unused image files saved in my DB. I did a cursory review in the 'uploads' folder and found some pictures with over 20 files saved, all different sizes. See attached screenshot.
This issue is no doubt making our database significantly larger than it needs to be. Our response time is sooooooo slow, and I believed it was largely due to the amount of content we have - over 1400 Wikis and growing. But now I'm thinking the number of image files has a lot to do with it. BTW, I have 'smushed' the image files and that only helped a little.
Can you suggest a plugin, or method of globally removing all unused image files other than going into the uploads folders (14 months of uploads) and deleting them individually? There has got to be some plugin or code that can see when a file was last accessed, and deleting all those files that have never been accessed.
Support access has already been granted.
Thank you very much in advance for your assistance.