Thumbnail Images are loaded even when they are not rendered on the page. This can be verified by opening the browser debugger and monitoring the network traffic. With no table view loaded, and the left column of results set to list view (as opposed to gallery view), there is no place that the thumbnails are rendered to the user upon receiving a query response. However, the UI attempts to download the first 25 thumbnails anyway.
Ideally, these calls would not happen until the thumbnails are to actually be rendered on the page.