[Bug] Claude Code performance degradation after recent update

[ggarg2510]

Bug Description
Performance Issue with Claude Code
Claude Code is running significantly slower than usual despite being on the Max plan. The degradation appears to have started recently, possibly coinciding with a recent update. Tasks that previously completed quickly are now taking considerably longer to execute.
Details:

Plan: Max
Issue: Noticeably slow performance and extended execution times
Possible trigger: Recent version update

Is anyone else experiencing similar performance issues with Claude Code? Would appreciate any insights into whether this is a known issue or if there's something specific causing the slowdown.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.12
• Feedback ID: 4c546967-1321-45eb-8e81-6126a029e70b

[github-actions]

Found 3 possible duplicate issues:

1. [Bug] Memory leak in Claude Code causes excessive RAM consumption  #19056
2. [Bug] Claude Code CLI performance degradation after sustained usage #17590
3. [Performance] Extreme CPU/RAM usage and thermal throttling on Apple Silicon since v2.1.4 #17563

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🤖 Generated with Claude Code

[jurmadani]

I had the same problem since sunday, I canceled my plan and requested a refund.

[poopgyu]

제 것은 멍청해졌습니다. 확연히 멍청해졌습니다. 이전 Sonnet 4.5보다 Opus 4.5가 멍청하고, 토큰만 더 많이 소모합니다.

[ggarg2510]

downgraded to v2.1.2 which seems to be working fine for now

[what-name]

how do you downgrade?

[ggarg2510]

using Claude Code itself and explicitly asking it to disable auto-update.

It triggered these commands:

• npm install -g @anthropic-ai/claude-code@2.1.2
• which claude
• Claude --version

[guenichone]

You can use the command line: curl -fsSL https://claude.ai/install.sh | bash -s -- 2.1.2

[ramizik]

+1

[benji-farquhar]

It is still slow with version 2.1.2. It isn't the terminal application that is slow. It's the Anthropic servers. Unusable. Same issue with the VS Code extension.

Claude models in Antigravity are fast, i believe they're on Google's servers.

[slhck]

@benji-farquhar No, then you have a different issue. Claude Code definitely gets slow with sessions that have large terminal outputs. Reverting to 2.1.2 solves that issue for me.

[benji-farquhar]

@slhck Okay. Lucky you then.