I'm not entering the contest since they're not my forms but here are a couple to look at:
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eIMCI - oldy but goody with lots of logic. Swiping from one prompt to the next is often slow. It takes about 5 seconds to load on a Galaxy Tab A.
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SOAR facility survey - @Mary_Qiu shared this great form a couple of months ago. It also takes about 5 seconds to load on a Galaxy Tab A. The jump screen/hierarchy view takes about 2 seconds to load.