At my university, performance. The CS department was clued into Linux development but also the Haskell world so darcs use among students was high. Our underpowered lab machines and personal devices struggled with darcs for reasons I no longer remembered and a group of us made use of mercurial for an OS project and had a rough go of it as the patch sets got more and more convoluted. Back in those days the core was C but a lot of the logic was Python which struggled on the memory constrained devices available. Some one of us learned about git trying to get into Linux kernel work, told the rest of us and it was just comically fast, is my memory. I spent a tedious weekend converting all my projects to git and never looked back, myself.Some years later Facebook did a lot of work to improve the speed of mercurial but the ship had sailed. Interesting idea though.
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