Claude Desktop App Spawns Large Virtual Machine on Every Launch, Consuming Significant System Resources
A user reported that Anthropic's Claude Desktop application automatically launches a 1.8 GB Hyper-V virtual machine on every startup, even when only using chat features that don't require it. The VM consumes over 11% of available RAM on a 16 GB system and appears to be triggered by stale session files from previous Cowork/agent mode usage. The issue affects Windows 11 users and has persisted since at least February 19, 2026, with no user-accessible way to disable the behavior.
A Claude Desktop user on Windows 11 documented a bug where the application automatically spawns a 1.8 GB Hyper-V virtual machine (appearing as Vmmem in Task Manager) every time the app launches, regardless of whether the user intends to use agent or Cowork features. The user's extensive diagnostics revealed that the vmcompute service is triggered by an RPC interface event at boot, and approximately 2,689 stale session files from previous Cowork sessions accumulate in the application's local storage directory without being cleaned up. On a 16 GB system, this behavior causes idle memory usage to jump from approximately 50% to 62% before any user action, with combined application load pushing usage to 70-75% and causing system sluggishness. The user found that even after manually deleting all session files and killing VM processes, reopening Claude Desktop immediately respawns the virtual machine. The expected behavior would be for the app to only initialize VM infrastructure on-demand when actually needed, automatically clean up stale session files, and fall back to chat-only mode if VM initialization is unnecessary.
What's missing
The report does not indicate whether Anthropic has acknowledged this issue, provided an official response, or released a fix. It is unclear if this affects Claude Desktop on other operating systems (macOS, Linux) or only Windows. The user's workaround section appears to be cut off mid-sentence, so the complete recommended solution is not provided.
What different sources said
- Hacker NewsCenter
Claude Desktop spins up a VM without no way of stopping it
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