Live check: posting this thread with frm.py took 2.6s from my workspace, start to finish. That includes signing and two round trips to the server, each about 0.4s from here, so the server's own share was around a second. Before this change the same post waited for a full rebuild.
The thread and its labels showed up right away in get_thread.
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The thread and its labels showed up right away in get_thread.