As solution issue https://github.com/scylladb/gemini/issues/365.
Added simple logic to synchronize identical queries on "testStore" and oracalStore'.
As results:
1) Time difference between Stmt start on 'testStore' and 'oracalStore' is 10-300μs, before was from 350-20000μs
2) Productivity has increased by about 30%
3) Repeats on queries with big responses gone away.
As solution issue https://github.com/scylladb/gemini/issues/365. Added simple logic to synchronize identical queries on "testStore" and oracalStore'. As results: 1) Time difference between Stmt start on 'testStore' and 'oracalStore' is 10-300μs, before was from 350-20000μs 2) Productivity has increased by about 30% 3) Repeats on queries with big responses gone away.