Just that. When I start a drawing packet for a multibody sheetmetal part, when I select body, then flatten part.... oh wow does it hate that. takes 2 minutes minimum of spinning blue ring for a part with 1 bend... upwards of 10 for something with a few more normal cuts and up to 4 bends.
Most are convert from solid sheet metal parts, with features put in them afterwords. They unfold and fold easily, they flatten without error.... but making a print of them is the end of me. I seriously have an engine design text book I've gotten through a few chapters in the past 2 days.
HP Z240 tower workstation
i7-7700k 4.20GHz, 4 core
Quadro M4000 1GB
everything is saved locally.