What we mean by waiting time in the firefox developer tools

Question

I am using the Firefox developer tools to understand the my application network calls from the client to server , in this i am checking the Network -> TImings tab , can someone given what below field represent

Sending
Waiting
Receiving

and what it represent if the Waiting time is toooooo much value than receiving time , for example

waiting time is 10.3 sec
receiving time is 2 ms only

if waiting time is tooo much , that means is server is side code is not performing well ? , mean this waiting time is related to server side processing , how fast the server side is processing the request ?

Answer 1

Sending is basically Time taken to send the HTTP request to the server.

Waiting is the total wait time (by client) before receiving first byte of response from the server. This is equivalent of TTFB (in chrome dev tools)

Receiving is the time taken to read the entire response from the server (and/or time required to read from cache). In chrome dev tools it is termed as Content-Download time.

Please check Mozilla's documentation on Network for further details.