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• LogIncomingMessages = false
• ThirdPartyRoutingIsEnabled = false
• EnableIncrementalLogFileCreation = true (for persistent mode)
• TimestampsInLogs = false
• RecvCpuAffinity – you can find the description of this parameter here: FIX Engine parameters#RecvCpuAffinity
• DictionariesFilesList – to get best latency user should create FIX protocol XML file with minimal message/field set. Only used fields should be listed in the message. Path to the XML file should be passed to DictionariesFilesList parameter in the engine.properties. SessionExtraParameters::validation_.ignoreUnknownFields_ should be true.

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• SessionExtraParameters::validation_.isEnabled = false
• SessionExtraParameters::validation_.ignoreUnknownFields_ = true
• validateCheckSum_ = false; More about validation parameters is here: How to configure FIX messages validation
• socketPriority_ |= Engine::AGGRESSIVE_RECEIVE_SOCKET_OP_PRIORITY
• aggressiveReceiveDelay_ = 0; this will cause 100% core usage. For Linux see also: How to use SO_BUSY_POLL socket option

Sending

engine.properties

• CheckVersionOfOutgoingMessages = false
• TimestampsInLogs = false
• EnableIncrementalLogFileCreation = true (for persistent mode)
• SendCpuAffinity – you can find the description of this parameter here: FIX Engine parameters#SendCpuAffinity
  
• DictionariesFilesList – to get best latency user should create FIX protocol XML file with minimal message/field set. Only used fields should be listed in the message. Path to the XML file should be passed to DictionariesFilesList parameter in the engine.properties. SessionExtraParameters::validation_.ignoreUnknownFields_ should be true.

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• SessionExtraParameters::validation_.isEnabled = false
• SessionExtraParameters::validation_.ignoreUnknownFields_ = true
• generateCheckSum_ = false; if remote side does not validate CheckSum(10) field, user can disable calculation of this field.
• disableTCPBuffer_ = true
• socketPriority_ |= Engine::AGGRESSIVE_SEND_SOCKET_OP_PRIORITY

Session::put

• PutOptions.overrideSendingTime_ = false; With this option user should get current system time only once and copy obtained value to SendingTime and TransactTime (if defined) field.
• PreparedMessage – where it is possible user should use this class instead of FIXMessage
• If PreparedMessage is not suitable, you should reuse sent FIXMessge objects