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The chain asked OpenLibrary's edition record first and its search index second. The edition record is the slow one: measured against this library it takes five to twenty-eight seconds, and it names its authors by key, so a second request was needed anyway. The index, asked for its fields by name, returns the title, the authors, the publisher, the language, a page count and the subjects together, in about a quarter of a second. Reordering them turns three requests per book into one, and a pass over five thousand books from fifty-three hours into well under one. The edition record is still there for a subtitle or a publisher the index did not give.