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Making EC2 boot time faster
It's possible to cut EC2 boot time from 40 seconds to 5 seconds by combining several optimizations like root volume streaming, instance warm pools, and instance resizing.
However, this turns out not to be the case, there are several ways to speed up the process, especially if you know the workload that will execute on the machine after boot, like a Docker image build or GitHub Actions runner. It's slow to access every block - for a 100 GB gp3 volume, which has a default throughput of 125 MB/s, running the fio above would take over 13 minutes! It's also possible to update the provisioned IOPS and throughput for certain EBS volume types, including gp3, if different performance profiles are needed during the warming or running phases.
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