Dragonwizard

You can right click the file name in cura and change it to whatever you want but not get rid of it entirely.

Almost 41,000. Have done some prints with 3 times that many faces.

It depends on the printer. I have an Ender 3 and I can adjust the feed rate after I start printing, which speed up everything by the same rate.

I have been using Cura 3.6 on my HP laptop since November but have upgrade to 4.0 recently. Everything on that laptop still works fine however I purchased a new HP laptop and when I save the gcode it will start to save, then crashes Cura midway through the save with no log as to why.