Investigate Out of memory issues with the current load testing

• Check results of the latest load testing where we fail with out of memory
• Check if it depends on txn type and load

Acceptance criteria

1. Run load tests with different txn types and different load
2. Find out if txn type affects memory issues
3. Find out if load affects memory issues and what load we can handle without issues
4. Find out if the number of unprocessed requests affects memory issues
5. Create necessary bugs or do simple fixes if needed