about "Update period"

[faithlm]

cann't find any description about "Update period" , what is it uesd to do ?

[chunfantasy]

Update period is used for rendering the UI, in order to indicate that the receiver is receiving packet or the transmitter is transmitting packet.
However, it will make the test result slight inaccurate.
If you would like to have accurate result, you should set it to 0.