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To enhance e ectiveness, a user's query can be rewri en internally by the search engine in many ways, for example by applying proximity, or by expanding the query with related terms. However, approaches that bene t e ectiveness o en have a negative impact on e ciency, which has impacts upon the user satisfaction, if the query is excessively slow. In this paper, we propose a novel framework for using the predicted execution time of various query rewritings to select between alternatives on adoi:10.1145/3077136.3080827 dblp:conf/sigir/MacDonaldTO17 fatcat:5ai4wudqbnap5n4ft5wkhhtjze