I've used a small DELL laptop (Windows 10) with touchscreen for a couple of shows. At home I use a HP (Windows 10) desk computer and I've run it with no problems on a Raspberry Pi (B+). Having said no problems, once while really putting a lot of stuff on the virtual screen - I came back from a break to find the program locked. But it has neve let me down at a performance. I.E. Setting up is probably tougher on the computer then playback.
I don't think adding to another's remarks with sarcasm is polite. So you "Would Love to see . . . " Well Duh! open google and type something like "Mini Computers". I saw about 4 less than $100; Typical "Refurb HP Compaq 6000-SFF WA2-0272 Desktop PC. Intel COre 2 Duo, Processor with 4 gig memory, 160 Gig HDD yada yada" For $85.98!
Often, it's not a matter of the computer but more a matter of having very little else run on it. If it's a dedicated machine, I wouldn't even load antivirus. Delete all the useless junk that come pre-installed. Run it clean and undistracted and a lot of that quirkiness will probably go away.