Description

I've noticed a consistent performance issue during long sessions. After performing around 6–7 consecutive compaction operations, the following symptoms occur:

Stuck in "Thinking" state: The model hangs in the thinking phase indefinitely (in some cases for up to an hour before timing out or disconnecting).

Dropped responses: The model either stops generating output entirely or requires repeating the same prompt multiple times to get a response.

Cumulative degradation: The more compaction cycles the context undergoes within a single session, the worse the stability and response times become.

Additional Context:

This behavior reproduces regardless of the selected model (tested across various LLMs via API / OpenRouter).

The issue is directly tied to the accumulation of history and the number of compaction cycles.

Questions:

Is this a known issue, and could it be related to how context compaction is implemented in OpenCode?

Could this be caused by the compacted context/system prompt becoming too noisy or degraded for the model's attention mechanism as the context window fills up, or is it an issue with sending a massive history payload from the client side?

Are there recommended configuration settings for clearing or limiting system history to prevent this degradation without losing critical session context?

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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