[BUG] ImageAnnotator not following FPS for caching

**Describe the bug**
On single frame large images it tries to load a lot of frames before allowing the user to advance.

**To Reproduce**
Steps to reproduce the behavior:
1.  On any large dataset (~15MB single image frames) load across the network and it takes a few seconds for the image to load and sometimes longer depending on how much it is caching.
