But i will have % loss on every outgoing connection, its Poland and its normal ( far better than few years ago, when 25% was normal ) and not every server is lagging :<
Well, it is what you define as normal. At our networks, at least in western europe, there is an allowance of 0% packetloss. Anything above this indicates problems, and requires fixing. Your ISP is probarly being cheap and not wanting to invest in either better equipment, or more bandwidth. Apperantly they have sorted there own internal networks propperly, as they show no packetloss.
Anyhow, as packetloss starts at that hop, it will get only worse behind it. Why? Because each lost packet, requires re-sending. When a packet is being resend, it can get lost again, which will make it resend again. This is in a TCP envoirment with error checking. UDP traffic won't be resend (unless 2 devices are configured with permanent error checking between them), the data will simply get lost. This is what you notice ingame as freeze's and lag, as packets send by the server are not always arriving at your side.(game traffic is UDP)