Customize these thumbnail URLs to a pretty one with URL rewriting. Then thumbnails can also be cached by Cloudflare or other CDNs, which could reduce a lot of requests from the timthumb.php file.
You may have in your digital inventory the best products in the world, but they won’t mean squat if no one would get to see them. This is why each and every online businessman will fight tooth and nail just to have a piece of the Internet traffic. After all, the more visitors who get to visit your site, the more potential clients you have.