The CPU usage for the 'claude' process (even when idle) goes high when this MCP server is enabled (affects in terminal mode as well as VS code extension mode)
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- Dominant language
- JavaScript
- Stars
- 188
- Forks
- 12
- Avg merge
- 2h 53m
- Merged PRs (30d)
- 17
Description
Steps to reproduce:
- Use Claude Code, via terminal or VS Code extension (without this MCP server or preferably without any MCP servers).
- Launch Claude Code and don't do anything there
- Monitor the CPU usage (let's consider this baseline)
- Now, install this MCP server (https://mcp.mdn.mozilla.net/) in Claude Code
- Launch Claude Code and don't do anything there
- Monitor the CPU usage (on my Ubuntu 22.04, the CPU usage by Claude Code's process is around 4 to 5 times of the baseline we noted in previous steps)
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the comparison with Claude Code in terminal and VS Code extension mode, first without MCP servers and then with https://mcp.mdn.mozilla.net/ enabled, while monitoring the Claude process on Ubuntu 22.04. Profile or inspect the MCP server's idle behavior to identify the source of the 4–5× CPU increase; done means idle usage is close to the baseline in both modes.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 45/100