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yellow is shit, everything else is okay.

check this page for really straight forward detail on the subject: http://konr.co.uk/lerp/

The COLORS on the net graph are mostly useless to be honest. All they do is make people misread the TF2 Network Graph article and spread stupid rumors like
Uninformed Moron wrote:
35 on Valve servers is orange, which is okay. That represents a warning of possible lost packets. Yellow IS lost packets.

I learned all of this from word of mouth and decided to ignore all existing literature on the subject.

Yellow Lerp: The server’s framerate is such that its own internal update interval is less than your interpolation time. Usually L4D2 servers calculate 30 frames per second, so, again, anything below 33ms will show up as yellow on a Valve Official/default dedicated server. Of course, your interpolation value will still work just fine. It will just look yellow on network graph. :|

Orange Lerp: Your interpolation value is set to less than 2 / updaterate. This condition only appears when the Yellow lerp condition is not triggered. This is also completely bullshit. It’s basically a warning that when you lose packets, you’ll probably see entities jump around. The value they use (2 / updaterate) Is not completely arbitrary. If you actually set your interpolation value to 2 / cl_updaterate or above, you’ll have 2 extra buffer packets in your interpolation range in case any update packet ever gets lost.
Again Orange lerp is all about “What if I lose packets?” It’s only a warning that entities may jump around if a packet is lost.

Neither yellow or orange lerp on network graph are indicators of packet loss or any other network issues.
If you have yellow lerp, asking the server admin to turn up the server framerate is a good idea. In practice, neither of those conditions really matter at all.

Quoted from Popcorp

people say – Hitscan = white lerp
Projectile + Spy and Medic = Orange (lowest interp)

amby and revolver are hitscan – gunspy = white lerp

Quoted from Popcorp

[…]

well that’s for Gunspy only, you want lowest interp for Backstabs =)

Yes and DR feinting also. Just wanted to point it out that spy can decently play with different colors

Interp is the best placebo to ever be introduced into this game.

if interp doesnt matter why isnt everyone playing with interp 0.1 then :>

Quoted from Solid

Interp is the best placebo to ever be introduced into this game.

Most of the changes are placebo, just like any other preference feature. Either way people should find a interp in wich they think they hit the most, stick to hit and let the placebo boost them. When I changed from .0245 to .030 I noticed some difference but I didn’t when I changed from .0152 to .0245. Netcode is important still