wareya>3. This is a good setting for a good connection, don't know what's so funny
No, it is not a good setting for a good connection. Setting the interp ratio to 1 causes models to stutter roughly every other frame due to networking jitter, because any two adjacent messages have roughly a 50% chance of having longer than "interp_ratio 1" time between them, causing the second message to be considered missed for a given frame and with extrapolation is disabled in TF2 and an updaterate of 66 on a refresh rate of 60 you'll be skipping six out of sixty six animation frames per second and everything will be in the wrong position most of the time (usually behind where it "really" is for lag compensation). This is why many people experience rockets warping through scouts, and it's the prime suspect of people getting bad hitreg.
That's interesting, what is interp_ratio supposed to be at in that case?