anthropics
[BUG] Claude is Extremily Slow
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
Since yesterday 23/11/2025 , claude is very slow, responses from LLM taking a life... so 400 errors, and performace degraded.
What Should Happen?
Since yesterday 23/11/2025 , claude is very slow, responses from LLM taking a life... so 400 errors, and performace degraded.
Error Messages/Logs
Steps to Reproduce
Claude Model
Sonnet (default)
Is this a regression?
Yes, this worked in a previous version
Last Working Version
No response
Claude Code Version
claude --version 2.0.50 (Claude Code)
Platform
Anthropic API
Operating System
Windows
Terminal/Shell
Windows Terminal
Additional Information
No response
Found 3 possible duplicate issues:
- https://github.com/anthropics/claude-code/issues/12183
- https://github.com/anthropics/claude-code/issues/12247
- https://github.com/anthropics/claude-code/issues/12184
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I have this issue as well, Claude Code is taking 20 minutes to finish basic tasks that it could normally do in 1 minute. I am using the Claude extension as a workaround until this is resolved.
Typing, copy/pasting, interacting with claude code is just horribly slow.
Can confirm this, it makes it almost unusable right now, had to downgrade.
- Output generally feels way slower
- Feels like it's messing up context sometimes
- Interrupting is extremely slow and unreliable
- Queueing messages is basically impossible because of the lag
- Interface freezes regularly while it's making changes
any info how to downgrade is claude non-npm install?
FIX:
curl -fsSL https://claude.ai/install.sh | bash -s 2.0.49 + in your bashrc export DISABLE_AUTOUPDATER=1
Is it related to the new line changes tracking? It's gone from nifty to horribly slow, and seems related to when the change tracking kicks in to re-display such as just typing / and then backspace to go from a context where it's displayed to one where it isn't.
To downgrade, if like me you're installed via npm global: npm install -g @anthropic-ai/[email protected]
( This resolved it for me )
Thanks so much for reporting! So sorry about this. Please use 2.0.49 in the meantime, we are investigating on Claude Code side.
@szwang, honestly, it has already been happening for weeks that Claude's code consumes gigabytes of memory during task execution and becomes completely unresponsive. Calling tools with long stdout definitely causes this. You guys need to do a complete internal redesign of claude code, make UI asynchronous, avoid blocking ui thread with computations, I am not even mentioning memory leaks. The idea of the tool is brilliant, but the quality is far below amateur
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