My .tax2021 file is stored locally in the default Documents>TurboTax folder...so there should be no delay accessing/writing to it. I built my PC with a SSD, tons of RAM, and a powerful processor...basically overkill for any application like TurboTax. Something in their code during the recalculation is a bottleneck...they just need to figure out what it is and fix it. (There are a couple of more "errors" I've run into, but will report them separately.)
