Hi!
1. The plugin performance mostly depends on your server performance, but there are a few things you can do to make it better via configuration. Please check this chapter in the documentation, it explains everything, and there are great tips to improve performance: https://goo.gl/Rn6lG6
2. I think you want exact matching. You can turn that on on the General Options -> Behavior panel: https://goo.gl/0Gz6LV
Best,Ernest Marcinko
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