This is an incremental release. It includes two important optimizations.
The first is much better performance while zoomed-in. Panning while at maximum zoom, for example, was really slow. This was due to drawing the background under the entire image, including the parts that were off-screen. This has been addressed. Additionally, there is no point drawing the background at all if it doesn't extend past the image extents and the image itself is completely opaque.
The second is a general speed improvement by updating Tacent to leverage the memory and speed optimized string class. Most string manipulation functions in the viewer no longer have to allocate and free memory every time a change is made.
There is an additional improvement to the image meta-data screen. By right clicking a row you can now copy the information to the clipboard. You may also copy-all to get all meta-data tags and values in one go.
Lastly, the background checkerboard size may now be set in the preferences.