Optimize the Virtual Machine
A Yocto build is CPU, RAM, and disk intensive. These settings significantly reduce build times.
CPU
Assign as many cores as possible — Yocto parallelises aggressively.
VirtualBox: Settings → System → Processor → set to the number of physical cores on the host (not logical/hyperthreaded).
VMware: Virtual Machine Settings → Processors → increase processor and core count.
Then match the Yocto configuration in local.conf:
RAM
The minimum for a Yocto build is 8 GB. 16 GB or more is recommended, especially when building large packages such as Qt or the Linux kernel with many parallel jobs.
VirtualBox: Settings → System → Motherboard → Base Memory.
VMware: Virtual Machine Settings → Memory.
Disk
Size
The Yocto build directory can exceed 100 GB. Allocate at least 150 GB for the VM disk to avoid running out of space mid-build.
Do not build on a shared folder
Shared folders (VirtualBox shared folders, VMware HGFS) have significantly higher I/O overhead than native virtual disks. Always place the Yocto workspace on the VM's native disk:
Use a fixed-size disk
A fixed-size virtual disk (as opposed to dynamically allocated) avoids fragmentation and gives more consistent I/O performance, especially on spinning disks.
Enable hardware virtualisation
Ensure hardware virtualisation is enabled in the host BIOS (Intel VT-x or AMD-V). Both VirtualBox and VMware require it for 64-bit guests and good performance.
VirtualBox: Settings → System → Acceleration → check "Enable VT-x/AMD-V" and "Enable Nested Paging".
Install guest additions / VMware tools
Install the guest additions to enable clipboard sharing, dynamic screen resize, and better driver performance.
VirtualBox:
VMware: