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yii2 默认密码hash加密cost的值太高,导致加密缓慢,多用户同时登陆时系统卡慢,经过测试10个用户同时登录的工况共登录400个账号用时120s左右。将cost下调至10之后用时30s,和用户不存在(不需要加解密)的工况的用时在误差范围内。