my minecraft crashes every time i play multiplayer

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What I expected to happen was...:
Describe what you thought should happen here
that i wouldnt crash so much when i play on a multiplayer server
What actually happened was...:
Describe what happened here
i crash a lot when i play CTF CTW
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...