Just curious. It’s way faster than the stamdard OMS. I also like it because it’s cute.
Good year everyone! 
Assuming you mean OMT.
The answer is simple: it contains less data.
OMT is meant as a full map, while shortbread is meant as a base layer that you can add to.
This difference should be lesser as soon as OSM and our ecosystem at large (hopefully) switches from MVT (Mapbox Vector Tiles) → MLT (MapLibre Tile spec) encoding, which given the smaller file transfer size would be nice.
As with everything in engineering, a Work in progress.
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ty for answering 
that will be an exciting upgrade when it comes. it’s hard to wait and see how the changes you’ve been working on sometimes 