I see a lot of complaints about how terrible the SmartThings app is, usually comments about it being slow.
Just want to throw in here that my experience is very different. It may be that my implementation is simple and small (under 70 “devices” total, under 50 physical devices, 70/30 mix of Z-wave/ZigBee, 100% stock DTHs, no Edge yet).
For me the app is ready to go within 2 or 3 seconds of opening. This is on Android 13 on a Google Pixel 4a-5g phone and Android 11 on a Samsung S5e tablet.
I’m also seeing greatly improved performance on my meshes. One of the most used things I do is turn all lights off at bedtime (almost all my devices are smart switches/dimmers). Used to be I had to use a fairly complicated Alexa routine with multiple pauses and careful control of the number of device commands sent without waiting. Over the last few updates I’m able to blast pretty much all my devices in one go and get near instantaneous response.