LeanThreads

LeanThreads helps keep long AI Chat conversations responsive by reducing how much conversation history the chat page has to render at once. Long chats can become slow because the browser has to keep rendering and managing a growing message history. LeanThreads keeps the active chat view focused on a configurable number of recent messages, while older context remains available through a local context drawer. Currently accelerates ChatGPT and Claude, and allows export of many others Key features: - Configurable active-message window - Local older-context drawer - Clean Markdown and JSON transcript exports - Summary-prompt export for handoffs - No third-party servers - No analytics - No ads - No payment system - No remote code - No persistent transcript storage by default LeanThreads is designed for people who use browser AI Chats for long research, coding, planning, writing, QA, or project-management conversations and want the page to stay usable as the thread grows. Privacy-first behavior: - Conversation content is processed locally in your browser - Raw transcript snapshots stay in tab memory while enabled - Settings and aggregate counts use extension storage - Exports are created only when you choose to export - Citation markers and session-local artifact links are cleaned from default exports LeanThreads does not change Chat’s model, account, subscription, or server-side history. It only changes how much of the conversation is rendered in the browser UI and gives you local tools for browsing and exporting context.