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Quoted from AnAkkk

With the connection you have you can just put rate to its maximum – 1048576.
1048576*8 = 8388608 bits/s = 8388,608 kbit/s = 8,388608 Mbit/s.
This matches a 8 Mbit/s connection.

80000 would match a 640 kbit/s connection.

when setting the rate to your suggested numbers, should I edit any other of the given commands?
cl_cmdrate 66
cl_interp 0
cl_interp_ratio 1
cl_lagcompensation 1
cl_pred_optimize 2
cl_smooth 0
cl_smoothtime 0.01
cl_updaterate 66

Quoted from AnAkkk

[…]

Not really, although you may not want to disable prediction error smoothing (cl_smooth).

why?

Quoted from h1

[…]

why?

https://developer.valvesoftware.com/wiki/Source_Multiplayer_Networking#Input_prediction

It’s just that your view won’t be “smoothly” moved to the correct position so you may see it “jumping”. It’s just a matter of preference.