Scrolling Slow in V1.0 / Feature Request Define Model per Agent

backscrolling is still very slow and not reactive like any other window you would scroll through.
i would love the following feature: for each agent i define, define what model it uses. seems not to be supported right now. this due to cost, i would like to use sonnet all the time but its too expensive, i would like to use it just as an instructor (frontend bot) and all agents could use a smaller model if well instructed.

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

For the scrolling performance issue:

Text rendering is VERY slow (and CPU usage is really high even when idle) #811: Text rendering is VERY slow (and CPU usage is really high even when idle) - describes very similar scrolling and rendering performance issues with high CPU usage
significant performance regression with text animation #2083: significant performance regression with text animation - mentions similar performance issues that could affect scrolling

For the model per agent feature request:

Per-Model Instructions #1891: Per-Model Instructions - requests the ability to define different instructions per model/provider, which is conceptually similar to defining models per agent
[FEATURE]: custom model aliases #3439: [FEATURE]: custom model aliases - proposes a system for model aliasing that could help with cost management by allowing easy model swapping
[FEATURE]: Disabling specific models through opencode.json #3411: [FEATURE]: Disabling specific models through opencode.json - related to controlling which models are available/used

Feel free to ignore if none of these address your specific case.

I believe it would have been better to have them as two separate issues.

Also to my knowledge you can already define a default model per agent.

ok thank you, do you know where i find the docs to configure the a model for each agent? then i close it here.

{
  "agent": {
    "build": {
      "model": "anthropic/claude-sonnet-4-20250514"
    }
  }
}

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