My main computer is a mid 2010 Mac Pro and despite the age it’s still fast, even by current standards. The only obvious weak point is the original graphics card and that basically stopped me from upgrading to Mojave initially.
I’ve also held back, partly for compatibility reasons with some of the other software like Photoshop CS6 and Lightroom 5.7, since I am not going down the subscription route with Photoshop CC anytime this century. I’ve just found a 4 gig graphics card recommended by Apple as being suitable for Mojave that isn’t too expensive, so I am inclined to give it a go. Time will tell if it will still be OK with 10.15.
Has anybody seen any obvious differences in performance using Mojave or High Sierra using Blocs 3 or indeed Blocs 2? I am guessing that @Norm does most of his testing and development on Mojave, so in theory that should be the best bet. Any thoughts on the two systems in general for stability and speed etc? Issues after upgrading?