As part of my playing around I downloaded a playlist with 4,530 320kbs AAC files in it with a total size of 43.5GB. My Roon Core was running on an AMD Ryzen 9 5900HX with 32GB RAM & all the drives SSD and it was running Windows 11. Roon ARC was running on an iPhone 14 Pro Max. My Ryzen PC was hard wired to my router and my iPhone was connecting via WiFi and was about 2 metres away from the router with no obstructions between it and the router. I timed the download and it took 2 hours and 36 minutes. I changed the iPhone auto-off setting to “Never” before starting the download and about half way through I plugged the phone into a charger because the battery was draining fast enough that I was worried it might run out before the transfer completed. My phone also got quite hot but to Roon’s credit the whole transfer completed without Roon ARC crashing.