Anyone knows how sparrow manages to use whirlpool without a dojo (with just an electrum server) while samourai requires a dojo?

I thought the dojo was required to talk with the whirlpool blinded coordinator. Is sparrow running a shim dojo in its code?

One of the dojo's components is the "tracker" which needs to process every block and takes some time. How does sparrow manage to not need that?