Delay: Between two requests within the same thing. Refresh: between refreshing the same channel.
Refresh: 300s, delay 1000ms:
t=0: request channel 1
t=1: request channel 2
t=2: request channel 3
t=300: request channel 1
t=301: request channel 2
t=302: request channel 3
And so on.
Please note that channels with the same stateExtensiob are refreshed with one request.