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The following workaround provided by support seems to help. I think we are hitting the Electron bug in MacOS Tahoe that is affecting many apps....
I sent the tech log to support and they have sent it for code review. I reproduced it on the macOS 26.0.1 released today as well.
I'm having the same issue with MacOS 26, Parallels 26 Pro & Windows 11 24H2 Coherence mode drives GPU usage to 65-80% consistently and pretty much...