## Z3 real arithmetic and statistics

问题 Given a problem that is encoded using Z3's reals, which of the statistics that Z3 /smt2 /st produces might be helpful in order to judge if the reals engine "has problems/does lots of work"? In my case, I have two mostly equivalent encodings of the problem, both using reals. The "small" difference in the encoding, however, makes a big difference in runtime, namely, that encoding A takes 2:30min and encoding B 13min. The Z3 statistics show that conflicts and quant-instantiations are mostly