When authoring mode is enabled, the BlenderBIM Add-on keeps track of any objects you edit or move around, so that when you export, those changes are synchronised with the IFC model. If you are not authoring the BIM model, such as if you are just viewing or deriving data, or doing non-geometric data manipulation, you can safely disable authoring mode, which will speed up exports.
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When authoring mode is enabled, the BlenderBIM Add-on keeps track of any objects you edit or move around, so that when you export, those changes are synchronised with the IFC model. If you are not authoring the BIM model, such as if you are just viewing or deriving data, or doing non-geometric data manipulation, you can safely disable authoring mode, which will speed up exports.