Termimus v0.4.7

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Release v0.4.7 — Terminal Typing Latency Optimizations & TCP_NODELAY

This release focuses on terminal responsiveness and keystroke latency, eliminating network TCP buffering delays and streamlining the I/O pipeline between xterm.js and the Rust backend.

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⚡ Performance Improvements

• TCP_NODELAY (Disabled Nagle's Algorithm):

  • Explicitly invokes set_nodelay(true) on client TCP sockets before initiating the SSH handshake via connect_stream.
  • Eliminates the 40ms to 200ms per-character latency penalty previously caused by Nagle's algorithm buffering tiny keystroke packets while waiting for remote TCP Delayed ACKs.
  • Uniformly applied across Terminal SSH, SFTP, and SSH Port Forwarding Tunnels.

• Adaptive Zero-Delay Output Coalescing:

  • Re-architected the Rust PTY output streaming loop with an adaptive flush mechanism:
    • Interactive / Idle Stream: Keystroke echoes and prompt responses are emitted to the frontend immediately (0ms artificial delay), delivering an instant, tactile typing experience.
    • High-Throughput Bursts (cat, htop, build logs): Output arriving during active bursts is automatically coalesced into ~8ms / 64KB batches to safeguard Tauri's IPC event bridge against saturation.

• Non-blocking Concurrent Writes (RwLock):

  • Migrated SessionManager.sessions from tokio::sync::Mutex to tokio::sync::RwLock.
  • Keystroke writes (write) and terminal geometry adjustments (resize) now acquire concurrent read-locks without blocking each other or locking against active connections.

• Frontend Garbage Collection Optimization:

  • Converted TextEncoder instances in XtermView.tsx and useSessionStore.ts into module-level singletons, preventing object reallocation and GC spikes during rapid typing sessions.

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📦 Component Versions

Component	Version	Package
Desktop Client (Tauri + Rust + React)	v0.4.7	Releases
Self-Hosted Sync Server (Go)	v0.4.7	ghcr.io/termimus/termimus-sync

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📝 Commit Summary

• 8280b0f perf(terminal): enable TCP_NODELAY & adaptive zero-delay echo; bump v0.4.7

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