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Pones echo=True en tu conexión, corres el programa y miras la consola: si para mostrar UNA lista ves el mismo SELECT repetido 50, 100, 500 veces… ahí está. Es un problema N+1: tu ORM le está dando mil viajes a la base de datos en vez de uno. ¿La solución? Se arregla en una sola línea. El video completo —con el benchmark y el paso a ...
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