Plan HTML page takes around 5 seconds to load and shows a long loading state on macOS

Hi, thanks for building Plannotator.

I’m using Plannotator as the Plan Mode UI for my agent, and I’ve noticed that the Plan HTML page is consistently slow to open. Every time the Plan page is opened, Chrome shows a blank/loading page for around 5 seconds before the UI becomes usable.

I’m not sure whether this is expected behavior in v0.20.0, or whether it might be related to my local setup.

Environment:

OS: macOS
Browser: Chrome
Plannotator version: v0.20.0
Agent: Pi
Terminal: cmux

What I’m seeing:

I trigger Plan Mode from my agent.
Plannotator opens the Plan HTML page in Chrome.
The page stays blank / stuck on a loading state for around 5 seconds.
After that, the Plan UI appears and becomes usable.
This happens every time I open a Plan page, not only on the first launch.

I’d be happy to provide more debugging information, performance traces, or logs if there is a preferred way to profile this.