kimmking edited a comment on issue #4341: shardingsphere 4.0.0 retrive very slow that sql script URL: https://github.com/apache/incubator-shardingsphere/issues/4341#issuecomment-587377554 @ancientelves After discuss with @terrymanu , I find the key point about this issue. The parameter `max.connections.size.per.query` in `server.yaml` is 1 by default. This means 16 sub query to each table one by one via a same connection. In my case, the cost is 250ms by proxy sharding, and came down to 90ms by set the parameter to 8, better than only one table. And a tip here : don't modify this parameter to a higher value in your production env, cause it maybe exhausted your jdbc connections in datasource pool.
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