Since the nether update on iOS Minecraft will lag if Iām playing on cellular data. Cellular data is enabled in settings as well as in Minecraft itself. The menu screen is at 1-2 FPS and very unresponsive. I can only play on WiFi or if I have a VPN enabled.
Thank you for your report!
We're actually already tracking this issue at MCPE-83859, so I will resolve and link this ticket as a duplicate.
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