[BUG] IME input causes performance issues and duplicate conversion candidates

## Environment **Platform (select one):** - [x] Anthropic API - [ ] AWS Bedrock - [ ] Google Vertex AI - [ ] Other: **Claude CLI version:** 1.0.10 (Claude Code) - Latest changes: Added markdown table support, improved streaming performance **Operating System:** macOS 15.5 (Build 24F74) **Terminal:** Terminal.app **IME:** macOS default Japanese IME **Account:** Claude Max Account **Model:** Default Opus 4 for up to 20% of usage limits, then Sonnet 4 (currently using Opus) ## Bug Description When typing Japanese text using macOS default IME in Claude Code, the application becomes significantly slower and displays duplicate conversion candidates. The IME conversion candidates appear in a separate system popup window instead of being properly integrated with Claude Code's input field, causing performance degradation and a poor user experience. ## Steps to Reproduce 1. Launch Claude Code in Terminal.app on macOS 2. Start typing Japanese text using the default macOS Japanese IME 3. Observe the conversion candidate behavior during typing ## Expected Behavior - Japanese IME input should work smoothly without performance issues - Conversion candidates should be handled properly within Claude Code's interface - No duplicate or separate conversion candidate windows should appear - Typing experience should be as responsive as typing English text <img width="241" alt="Image" src="https://github.com/user-attachments/assets/2700d46e-3ec3-4d07-bc46-a6592d370687" /> ## Actual

Posted by fumiya-kume on Jun 4, 2025, 12:20 AM

Tags

• support (SaaS)

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