"If your Linux distribution uses the systemd init system, you already have what you need to solve the problem of slow boot times. The tool in question is a part of the systemd init system, and it's called systemd-analyze. What this tool does is analyze and debug the initialization manager in Linux."
"If you were to simply run the command systemd-analyze, you'd see results showing the total startup time for the machine broken down into kernel time and userspace time, then the graphical.target reached time. That's some pretty good information, but there are some important options we can use to help us figure out what's going on."
Linux machines using the systemd init system have a built-in diagnostic tool called systemd-analyze that helps identify causes of slow boot times. Running the basic command displays total startup time broken down into kernel and userspace components, along with when the graphical target is reached. The tool offers several options beyond basic output, including a 'blame' function that lists all systemd unit files and shows the initialization time for each unit. This allows users to pinpoint which services or processes are consuming the most boot time and causing delays.
Read at ZDNET
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