it appears there are too many tiny objects in this image. It might also be too large. Can you downsample your image and use some binary opening/closing to get rid of tiny objects before applying connected components analysis?
Edit: No wait. MorphoLibJs Connected Components Analysis actually works. It’s the glaybey-visualisation which cannot deal with so many labels. If you use MorphoLibJs Connected Components Labeling with type float, it looks like this afterwards:
But if you then change brightness contrast (min / max grey values), you can see the one big object:
Reducing number of objects with binary operations might help anyway.
Let us know if this helps.