This guide I've created for beginners and for experienced players.
The play CS: GO has two teams to display in-game FPS.
1) net_graph (0/1 // FPS displays in the lower right corner (0 - disable 1 - enable))
Legend:
1.FPS - how many frames per second produces your video card.
2.Ping - delay.
3.Data - as tcp / ip packet you send and receive (do not pay much attention to it).
4.Kilobits per second (Translated: kilobits per second) - how many really kilobits you send and receive (you do not come in handy).
5. How many times per second your computer updates the position of your players on the server (out - below). How many times per second the server sends your player's position (in - top).
6.Loss - loss.
7.Choke.
2) cl_showfps (0/1 // Display the FPS in the upper-left corner (0 - disable 1 - enable))
When you list the given command in the upper left corner will display FPS and what map you're playing.
Conclusion: These commands are very useful and necessary, the team net_graph 0/1 displays you all the necessary information about your FPS, etc.
Team cl_showfps 0/1 will simply display your FPS and a map.