Startup requires a match in mnesia per message we encounter on disk. This lead to a 22minute startup time for 100000 messages. However, by dynamically adding an index during startup to mnesia, and then later removing it, this is reduced to 13.5 seconds. Note however, that to test this with rabbit_tests:rdq_time_insane_startup() requires the disk queue to be edited so that it starts up in ram_disk mode, not disk_only mode as is the code default.

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