Right now there is an open issue about a performance degradation in the last versions of OBS for macOS. https://github.com/obsproject/obs-studio/issues/2841 I don't know if it is correlated to your problem though.
Right now there is an open issue about a performance degradation in the last versions of OBS for macOS. https://github.com/obsproject/obs-studio/issues/2841 I don't know if it is correlated to your problem though.