I'm on 50/30 fiber, consistent < 10 ping to major websites (google,etc), even during the issues.
It happens where the chat lags badly...
Sometimes at the same time the QR's take forever to load up. CPU close to 0%, network barely used, pings to google,etc are sub 10ms.
Hot laps load fine however. I rebooted the pc twice and let cossaco know in chat, who said he's doing ok. Someone else mentioned lag in QR listings and chat too.
We're both in the USA, so I don't know if your host is primarily europe, which wouldn't affect cossaco as much.
Windows 7 x64, on 180 gb SSD, radeon 7950, 8gb ram, i5 2500k quad core cpu.