I have some idea as to why it froze, probably something to do with RNG again. Certainly not a hardware issue, this game could run on a calculator
Not sure about stuttering issues either, I would understand if it lagged while generating the map, but afterwards it should be doing nothing at all. No one else reported this so I don't know what can I do. Though one guy plays through Vine on Linux and had performance issues with Extra Tooltips enabled only, so maybe that's a clue