FastStone Image Viewer
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Full user review
"slow with lots of rough edges"
-Slow/buggy. Would hang for minutes at a time expanding directories in the file explorer. No idea what it was doing. (Definitely not previewing as no images there.)
-Rename facility is extremely basic. Compare with cam2PC which has a very flexible batch rename capability albeit prone to crashing once in a while.
-Rough around the edges. WIth default settings in full screen images appear jagged and aliased. Looks like the program just takes one sample for each pixel on the screen. Even "windows picture and fax viewer" does better!