Aras Pranckevicius
230f72347a
Previous code was doing N collection syncs when importing N objects (essentially quadratic complexity in terms of object count). New code avoids all the intermediate syncs by using BKE_layer_collection_resync_forbid and BKE_layer_collection_resync_allow, and then does one BKE_main_collection_sync + BKE_main_collection_sync_remap for the whole operation. The things done on the importer objects that are dependent on the sync happening (marking them selected) are done in a separate loop after the sync. Timings: importing Moana USD scene (480k objects) on Windows, VS2022 Release build, AMD Ryzen 5950X: 12344sec -> 10979sec (saves 22 minutes). Reviewed By: Bastien Montagne Differential Revision: https://developer.blender.org/D15215