I thought my Proxmox server was slow until I changed this setting
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Switching the Proxmox VM display setting from the default to SPICE can dramatically improve virtual machine responsiveness. The default display option causes sluggishness, cursor trails, and high-resolution bugs on Linux VMs. SPICE resolves these issues without requiring a dedicated SPICE client for GUI access. For Windows
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Switching to SPICE display made my Proxmox VMs a lot more responsiveBut you might want to use different tools for remote gaming VMsSort: