If you are experiencing issues with game performance, it helps to:
1. Make sure your Mac has sufficient space available on the startup disk.
2. Make sure your device has sufficient memory available for running GWENT.
3. Quit any apps that you are not using.
More detailed information can be found here:
https://support.apple.com/guide/mac-help/if-your-mac-runs-slowly-mchlp1731/mac