The ornaments, in this case trills or turns, look and sound easy until you take the piece at tempo. Our goal is 100 beats per minute. We have practiced scale exercises with one turn on each note, ascending and descending. If you are still having a difficult time, practice this exercise at home starting at 60 and gradually increase the tempo every day until you are faster than 100. This way, 100 will feel comfortable and not like a struggle. Remember, we want to make it look easy!
The second thing that makes this piece deceptively difficult is the fast slurred string crossings and lopsided bowings. Again, start slow, but make every movement purposeful. Make sure you are moving in the smallest way to achieve your goal. Extraneous movement will slow you down. Use wrist motions to change strings and elbow to draw the bow. Most of the aggressive string crossing sections are accompaniment, so you don't need to try to be loud. Balance between melody and accompaniment has been an issue so far, so allow yourself to relax!! The same can be said during double stop sections that need to be quieter.