Poor rendering performance

[hmorneau]

Describe the bug

I have a problem of poor rendering performance that been around for a while. The problem worsen as the conversation grow in length up to the point where it can hang for 30-45 seconds. Clearing the conversation always fix it. When the terminal hang, it's impossible to type, Ctlr-C to close the program also doesn't work.

What I find puzzling, is that sometimes the conversation can go on for 3 compressions cycle and stay fast and other time not longer after starting it start to hang.

Affected version

GitHub Copilot CLI 1.0.33-0.

Steps to reproduce the behavior

1. Start a conversation let it go for a while
2. The slowdown start after multiple back and forth and tools calls.

Expected behavior

Should stay fast like Claude Code, Codex CLI, OpenCode, etc.

Additional context

• M1 Max 32GB
• Happens in all terminal (VS Code, Ghostty, Terminal)

[hmorneau]

One thing I have noticed, 5.4 cause the CLI to slowdown much faster than if I use Opus, so I'm not sure what is the difference.

[mrairdon-midmark]

Still exists on 1.0.32. Crazy poor performance compared to 1.0.30 for some reason.

[hmorneau]

@mrairdon-midmark Yeah, I'm not sure when they will fix it. What specs your computer?