The issue seems to be related to disk I/O.
On the HP laptop with a hard drive, TurboTax Premier 2020 is experiencing extreme delay. TurboTax became responsive after 2+ hours. Subsequent delay could still be a few minutes each time I access the investment section; but at least I could continue.
Since I have a newer Lenovo laptop with a solid state drive, I installed TurboTax Premier 2020 and experienced only minimum delay.
Since both laptops have plenty of processors and memory, I guess the key difference is the speed of their storage.
