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I looked over it briefly and this looks like the way the datarate is handled (so we don't throw too much data at the client than their line supports, was big back in dialup days). The client used to be able to set this manually with /datarate it is in this case automated into OP_SessionStatRequest/OP_SessionStatResponse. The decay is removing (every 20ms I guess) the datarate byte count from bytes written to the client. The lower this value is the more likely we are to send new data out (BytesWritten needs to be less than RateThreshold to send out new data).


RateThreshold=1048576/250;
DecayRate=78642/250;

Keep in mind these default values can change inside OP_SessionStatRequest which is also part of EQStream.cpp.