Could someone explain the 'sluggish ui responsiveness' talked about in the conclusion? I've never experienced it in 11, 10, 8 or 7 etc - but maybe thats because

Could someone explain the 'sluggish ui responsiveness' talked about in the conclusion? I've never experienced it in 11, 10, 8 or 7 etc - but maybe thats because my windows machines are always gaming machines and have a contemporary powerful graphics card. I've used a mac pro for work a couple of times and never noticed that being snippier than my home machine.