Up to 256KB generated thumbnail size in SF 4.1
We use the Sitefinity 4.1 generated thumbnails in one of our public controls. The thumbnail images render correctly, however, they appear to be much larger than necessary. It seems that they are also padded with NULL characters (binary zeroes) perfectly to 8K, 16K, 64K,128K and 256K. For example, a 146x146 JPEG image is 128KB (see attached for reference). We have double-checked these results by running everything through Fiddler2 and Firebug.
We will cache the images to alleviate the bandwidth requirements, but first-load times will still be longer than necessary. We are not sure if this qualifies as "bug" per se, but we wanted to make you aware of what appears to be an inefficiency.
I've replied you yesterday in the Support thread.
We will investigate this behavior, and will get back to you.