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Answer Yes, the Avalanche supports window size scaling.  Window size scaling is automatically enabled when the receive window (in Client/Server > Network > receive window) is configured for 65KB (66560 bytes) or bigger.   The receive window is fixed for the test per setting and will not change during test.  A smaller receive window size value will disable the window size scaling.  In the tcp ACK messsage, you will see the window size scaling factor: -2 (no window scaling used).