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Thanks for the reply!

We're currently on the latest stable release for macOS. I cannot find an 19.6 prerelease build for macOS here:

When will be the release of 19.6?

Still can reproduce this on macOS 10.15.2 on a new MacBook Pro 16". OS says "High Energy consumption" and the client seems to use the GPU instead of the integrated graphics - even if not connected.