iOS 2018 Mac Mini poor simulator performance

adamk77

macrumors 6502a
Original poster
Jan 6, 2008
513
149
I have a 2018 Mac Mini. Everything is fine except the simulator is extremely slow when scrolling. It also does not register clicks very well.

I am guessing it has to do with the lackluster internal GPU (HD 630).

Before I spend money on an eGPU, I thought it prudent to check if anyone else has experienced this and if adding an eGPU will fix the issue.

I have 2015 MBP and that has an Iris Pro integrated GPU and it is fine, so a bit perplexed. Unless the HD 630 in the Mini is much worse than a 4 yo laptop. Or maybe it is somerthing else?
 

adamk77

macrumors 6502a
Original poster
Jan 6, 2008
513
149
Some additional info:

Ok, I'm not sure what's going on. I use a 43" 4K monitor at full 4K resolution (1:1 pixel mapping, no Retina mode).

  • 1920x1080 No warning

  • 2560x1440 (warning: Using a scaled resolution may affect performance.)

  • 3008x1692 (warning: Using a scaled resolution may affect performance.)

  • 3360x1890 (warning: Using a scaled resolution may affect performance.)

  • 3840x2160 No warning
What's strange is that I ONLY see performance issues in 3840x2160, even though there should not be any extra calculations because it's 1:1 pixel mapped. All other modes should require extra calculations.

Stranger still, everything else is smoother in 3840x2160 than in any other resolutions. It's only the Simulator that's slow.

....

More update in case it helps anyone else in the same situation:

Things are getting stranger still. The problem goes away if I connect by monitor to BOTH the USB-C and HDMI port on the Mac Mini and ONLY IF HDMI is the input source. I've tried different cables and different ports, and this is the only way the problem will go away. I've also tried attaching the monitor to the 2015 MBP via DisplayPort and it has the exact same problem at the 3840x2160 resolution.

Very weird.
 
Last edited:

adamk77

macrumors 6502a
Original poster
Jan 6, 2008
513
149
Ok -- no need to spend $$ on an eGPU. This is a bug with the XR (or the Xs Max) simulator at a certain resolution.

Tried with X and all is fine.
 

adamk77

macrumors 6502a
Original poster
Jan 6, 2008
513
149
Talking to myself but updating in case anyone runs into this thread.
Simulator other than Xr was better, but still had performance issues with input not being detected.

I ended up buying an eGPU and everything is great now.