#5 test perfomance

[Vitaliy Semochkin]

Test perfomance and consider using single StringBuilder for constructing whole message. This will make the code much more uglier, error prone and hard to maintain but might be useful for application under headvy load.

Personal oppinion, logging (string builder/ vs string for cleaner code) won't be a bottle neck cause logging is almost always used for services, and logic, networking and db access is always takes much more CPU and RAM than creating one extra string for message.