You might consider looking into the latest iPad Pro.....those things are stupid fast and powerful and I found doing some pretty intense stuff on mine (an older one)...It still rivals some desktops I've seen.
I did about a 15-17 RAW image focus stack on it not long back and I was amazed how fast it did the job, just took maybe close to a minute?
And again, mine is one of the first generation iPad Pro 10" models....the new ones are very snappy, and with Affinity Photo, whew...amazing stuff there.
Just a suggestion if you wanted to look for a new "toy".
HTH,
C