Using bucket, removes a lot of water quickly.  However, emptying the bucket is problematic because the Pump Arm will not hold at the top position.  You have to hold it up while trying to re-insert the bucket.  This issue must be known to the manufacturer as manual and multiple stickers "remind" user to ensure the Pump Arm is up before replacing the bucket.
Have just switched over to Continuous Drain function and if this works, the defect is avoided.  However, switching over to Continuous Drain is not intuitive without pictures in the manual showing correct setup.