Yes, I am running Turbotax Home & Business for Mac 2018 and it is frustratingly slow. I am running on a Mac Pro 2009 with SSD and 24 GB RAM. All my other apps are general quick and responsive but Turbotax has always been sluggish over the years. They need to rewrite the code or optimize it. The Mac spinning pinwheel shows up often in Turbotax. My tax files are usually only 8MB so it's not like I'm trying to edit a 12GB JPG in PHotoshop.
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