9600 - too slow communication speed NANO <> ESP

To connect NANO and ESP with BLYNK I use the hardware serial. For 9600 it quite frequently communications was blocked and BLYNK has setup new connection every 15-30 sek. Sometimes it was necessary reset the application i ESP.
Reduction the frequency of sending data to the server BLYNK from 1 to 5 seconds reduced block communication. But only increase transmission speeds to 115k completely eliminated this problem.