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ad8bac8328
Every per-link marker operation (start_marker / stop_marker / update_marker) called Project.dump() -- a full topology serialization + file write. A definition fan-out over 500 links therefore wrote the whole topology 500+ times (each blocking the event loop), which dominated the observed ~1 minute; the NIO round-trips themselves were negligible. Add a dump: bool = True parameter to the three per-link operations and inherit_marker (matching the existing dump param on Link.add_node). The bulk paths -- definition create fan-out, definition-update sync and re-fan-out, definition-delete cleanup, pause/resume, new-link inheritance -- pass dump=False and their caller dumps once after. apply_defs_to_new_link suppresses per-def dumps too: link create / project open dump once after, so opening a 500-link project with N definitions no longer does 500xN topology writes.