The number of bytes of data to generate in each server response. This is useful in controlling bandwidth. The default is 15,000 bytes.
The number of milliseconds to wait in between server responses. The default is 2 milliseconds
With a Burst Size of 15,000 bytes and a Burst Interval of 2 milliseconds, a server response with a 10-megabyte file will be broken up into multiple 15,000-byte chunks, each of which gets sent every 2 milliseconds, until the entire file is sent.