I use a Mac with a Windows partition. I've just upgraded to a nice new 2020 MacBook pro, but before that I was trading using a 2012, 4GB Ram, 11" screen MacBook Air, all using DAS, and whilst also screen recording and following the chatroom. I never had a problem, and I'm not sure there could have been a worse computer to be set up on! So no, I don't think you need a particular kind of computer. Sure if you're pulling in thousands a day then you might as well invest in a flashy gaming computer, but really a good internet connection is much more important IMO.