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Can You Figure Out Why a Simple Circuit Bogs LTspice Down at 700 us

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Build : LTspice XVII(X64) (1.7.0.360) Dec 13 2022, 02:47:55 US Pacific Test case : (Google Drive 8 kB zipped)  https://drive.google.com/file/d/1vWl0ZMB6GwsQwaJHG4GdO22Atp_7z30M/view?usp=sharing This is Robert Erickson's assignment in the Intro to Power Electronics Course on Coursera, from CU Boulder Won't finish in 20 minutes.. Had to kill it. Why? What did they break? BTW, Mike Engelhardt's new simulator will be out eventually, hosted by Qorvo.