Last friday, I've sent another server to a new ISP. It's just because several players had lags and packet loss. I've tried everything I can think of to reduce it on the current server - nothing helped. Thus I think there's something wrong at the current ISP. Maybe badly configured switches or not enough peerings or connection overload. I don't know tbh. Let's hope, the new ISP is better at that matter. Referring to the naked facts, it should be, just compare the ISPs peerings:
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Current ISP:
1 GBit/s DTAG - Deutsche Telekom
2 GBit/s Tiscali International
1 GBit/s DeCIX
1 GBit/s AboveNet
100MBit/s Kleyrex
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New ISP:
1x 10 + 2x 1Gigabit Global Crossing
3x Gigabit Tiscali
1x Gigabit Teleglobe
1x Gigabit Abovenet
1x Gigabit Telia Sonera
2x 2.5GBit De-CIX via TNG
1x Gigabit AMSTERDAM Internet Exchange
2x Gigabit Deutsche Telekom AG
1x Gigabit Vienna Internet Exchange
1x Gigabit Kleyrex Peering Exchange
1x 100 MBit NL-IX

The hardware is almost the same as the current one (Intel Xeon 3450, Intel server board etc.), just one thing changed: This time I didn't choose a SSD but a HDD RAID 1 - should be even more reliable. You'll notice a slightly increased map change duration. During playing, there won't be a performance difference. The current system turned out to be sufficient for UT. Under full stress, the CPU load never exceeds 10%. OK, have to admit that it's a quad core CPU and 10% means about 40% for single threaded apps like UT, but still ;-)
So let's hope lags and P/L will be gone

Ahh - forgot to tell: Server should be up on wednesday.