This tab allows configuration of the memory allocation of the VM. The following screenshot shows the dialog box for our example VM:

In Proxmox, we can set fixed or dynamic memory for a VM. Automatic range is also known as memory ballooning. For the fixed option, all memory is allocated at once. In the dynamic option, memory is allocated based on the VM, within a preset range. Automatic memory allocation works great for Linux-based guest VMs. But for Windows VMs, memory ballooning consumes a higher amount of CPU resources, causing the VM to slow down. So for windows VMs, it is best to use fixed memory whenever possible.