执行相同查询（只读）后，休眠速度变慢的原因可能是什么？

日志：

   368588 nanoseconds spent acquiring 1 JDBC connections;
   0 nanoseconds spent releasing 0 JDBC connections;
   158339 nanoseconds spent preparing 3 JDBC statements;
   33855736 nanoseconds spent executing 3 JDBC statements;
   0 nanoseconds spent executing 0 JDBC batches;
   0 nanoseconds spent performing 0 L2C puts;
   0 nanoseconds spent performing 0 L2C hits;
   0 nanoseconds spent performing 0 L2C misses;
   0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities and 0 collections);
   9437 nanoseconds spent executing 3 partial-flushes (flushing a total of 0 entities and 0 collections)
}
2020-03-24 09:02:54.488  INFO 12024 --- [io-8064-exec-10] i.StatisticalLoggingSessionEventListener : Session Metrics {
   44640 nanoseconds spent acquiring 1 JDBC connections;
   0 nanoseconds spent releasing 0 JDBC connections;
   134337 nanoseconds spent preparing 3 JDBC statements;
   33256438 nanoseconds spent executing 3 JDBC statements;
   0 nanoseconds spent executing 0 JDBC batches;
   0 nanoseconds spent performing 0 L2C puts;
   0 nanoseconds spent performing 0 L2C hits;
   0 nanoseconds spent performing 0 L2C misses;
   0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities and 0 collections);
   9156 nanoseconds spent executing 3 partial-flushes (flushing a total of 0 entities and 0 collections)
}
2020-03-24 09:02:56.143  INFO 12024 --- [nio-8064-exec-1] i.StatisticalLoggingSessionEventListener : Session Metrics {
   47060 nanoseconds spent acquiring 1 JDBC connections;
   0 nanoseconds spent releasing 0 JDBC connections;
   123461 nanoseconds spent preparing 3 JDBC statements;
   468759882 nanoseconds spent executing 3 JDBC statements;
   0 nanoseconds spent executing 0 JDBC batches;
   0 nanoseconds spent performing 0 L2C puts;
   0 nanoseconds spent performing 0 L2C hits;
   0 nanoseconds spent performing 0 L2C misses;
   0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities and 0 collections);
   9680 nanoseconds spent executing 3 partial-flushes (flushing a total of 0 entities and 0 collections)
}

从日志中可以看到，执行时间增加了十倍