Yeah, my young daughter is using my 2009 MacBook Pro Core 2 Duo 2.26 GHz (Geekbench 5: 330/600) and even at 9 years old, she comments it's too slow for some of her usage. It's OK for her Google Classroom based school work, but not good for web based educational games. However, her 2014 iPad Air 2 (Geekbench 5: 385/1080) is OK for that.
I set up a 2010 27" Core i7-870 iMac (Geekbench 5: 600/2250) on High Sierra for her and performance-wise that thing feels like a modern machine. Very peppy. My iPad Pro 10.5" (Geekbench 5: 850/2300) is around that speed and it's very good. However, while she'll use the iMac for some stuff, she still wants a laptop. I figure in a while I might get her a 2012 non-Retina 13" i5-3210M MacBook Pro (Geekbench 5: 650/1400), since it's reasonably speedy and easily upgradable, yet inexpensive. My wife's iPad 7th generation (Geekbench 5: 770/1425) performs around that speed and feels quite decent.
And for myself, to replace my misbehaving 2007 Mac Pro, I just ordered an old 2014 i5-4278U Mac mini (765/1680) for my daily office work which involves mainly VPN and business applications. My 2017 Core m3 MacBook performs around that level and I find its performance perfectly fine for that type of work.
I know GB5 isn't always the best representation of performance "feel" but overall I think it works decently enough to gauge Mac and iPad peppiness.
300/600 - Too slow for mainstream usage
400/1000 - More tolerable, but still quite slow
600/1400 - Decent, good enough for many budget users for mainstream use. I consider this low end entry level these days.
700/1700 - Good
800/2300 - Very good
1000/3500 - Excellent
Note, this is not for stuff like video editing, etc. There it's harder to compare but in general I find the iPads do better than the Macs.