Hey there rosdeep,
We understand you're running into a performance issue when doing certain tasks, like screen recording a game or using Guided Access. We'll be happy to help.
Performance can be impacted by a number of factors, including network availability, location, and software.
To start, make sure your iOS and apps are up to date to the latest versions: Update your iPhone or iPad - Apple Support
If the issue happens with a specific app, follow these steps: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support and follow up with the Developer if needed.
Take care.