Since optimizing SSDs is not recommended and significantly reduces the life of an SSD, why does the Venue Pro 8 ship with auto-optimization scheduled on its primary SSD?
This is probably something you should look at, Dell.
Windows 8.x performs a trim on SSDs automatically (instead of defrag), so what you are seeing is correct.
Optimization in windows 8 for SSDs is simply running trim. It's safe and isn't really a problem.