Samigo > improve performance when copying questions from pool to quiz

The performance of copying questions from a question pool to a quiz is a little sluggish. In our testing, using a question pool of 25 questions, it took an average of ~19000 ms to copy all 25 questions from the pool to a quiz. The larger the number of questions imported, the longer it takes.

After the PR is applied, this same process using the same site, same quiz, and same 25 questions from the question pool reduced the processing time to an average of ~2800 ms.