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To optimize device boot time, use the meta-qcom/ci/performance.yml configuration. The performance.yml file modifies KERNEL_CMDLINE_EXTRA to append the quiet option to the kernel command line, reducing console output during boot and improving boot performance. To start the build environment, run the following command: 
kas shell meta-qcom/ci/<machine-name>.yml:meta-qcom/ci/<distro-name>.yml:meta-qcom/ci/performance.yml