rolling up my sleeves...

Step aside, bros, I got this

Take it away Bloodsire

With ping exceeding 140, use default interp (0.1)

This is the only thing that can be done. You might try praying to Odin but this is risky as Odin is temperamental and may enjoy your suffering.

Thanks bloodsire:D
I'll give it a try:)

The higher the interp the better your hitreg will be. However, things will be displayed much later.

2/updaterate

latency is compensated for

if you have choke or loss lower updaterate or get a better connection or stop playing on servers from other continents

this is a nice thread, everyone's giving good advice.
The reason to use cl_interp 0.1 for really high ping connections isn't because it's actually inherently better for more latent connections, but because higher ping goes hand-in-hand with high jitter/an unstable connection/packet loss.
having "very" high interp (like default) fixes this, but beware projectiles will come out later like this, as always when you raise it. so yeah bloodsire's right, just wanted to give some reasoning.
https://dl.dropbox.com/u/1811521/interp.html

Thanks for everyone giving such good adivice:D I read all of Your posts and I'm still testing it out...
Wish me luck;)