Severe sluggishness in OpenCode Desktop on Windows (even with OpenCode Go)

[praveen631264]

Description

I am experiencing severe, unusable sluggishness when using OpenCode on Windows. The extreme lag occurs even though I am subscribed to the OpenCode Go API.

Initially, I thought this was a UI rendering issue in the Desktop app, but I have confirmed that the OpenCode CLI is equally slow. This suggests the bottleneck is at the engine level (possibly file I/O indexing loops or network/proxy timeouts), rather than just the DOM rendering.

I have already tried the following without success:

1. Completely uninstalled and reinstalled the application multiple times.
2. Deleted local session caches and storage (%USERPROFILE%\.local\share\opencode).
3. Tested the CLI directly.

Steps to Reproduce

1. Open Opencode
2. in the chat window type anything it takes 1-2min to Thinking to come
3. Thinking takes another 1-2min to respond

Expected Behavior

OpenCode Desktop and CLI should remain responsive, and OpenCode Go API requests should process quickly without freezing the application or terminal.

Actual Behavior

The application and CLI are extremely slow, laggy, and unresponsive, making it practically unusable.

System Information

• OS: Windows [ 11]
• Subscription Type: OpenCode Go
• Hardware Specs: [32GB RAM, Ryzen 5000 processor]
• Antivirus/Proxy: [Default Windows Defender, No VPN / Company VPN]

Additional Context

Since deleting .local/share/opencode and trying the CLI didn't resolve the lag, the issue seems to persist independently of the desktop UI's cache or rendering engine.

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• No issue template was used. Please use one of the three templates: Bug Report, Feature Request, or Question.
• Missing required fields for a bug report: no structured Description, no steps to reproduce, and no system/environment information (OS version, OpenCode version, hardware specs, etc.).
• The report lacks enough context to diagnose the issue — please include what you observe, when it happens, and how to reproduce it.

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

---

This issue might be a duplicate of existing issues. Please check:

• [BUG]: Severe latency when invoking agents via @mention in Desktop App (Windows) #31293: Severe latency in OpenCode Desktop App on Windows (similar Windows performance issue)
• Last couple of releases have serious hanging #37241: Recent releases have serious hanging/sluggishness
• TUI becomes laggy/unresponsive with large sessions (1000+ messages) #38435: TUI becomes laggy/unresponsive

If you believe this was flagged incorrectly, please let a maintainer know.

[praveen631264]

opencode-debug-20260728T032635.zip

[github-actions]

Thank you for updating the issue with all the details! Your bug report now includes a clear description, steps to reproduce, expected/actual behavior, and system information. We appreciate you taking the time to provide that context.