Teworlds lags (jerky)

Hey guys,

my "Teeworlds" jerky without end ...
Before, I could einbarfrei games, but not anymore no idea why.

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My details:

DSL line: 9,000
W-LAN: 300 Mbit / s

RAM: 2 GB
Graphics card: 265 MB
CPU: AMD Athlon (tm) 64 X2 Dual Core Processor BE-2350, 2109 MHz
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Sincerely,
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Jannyeis