MacBook Air spends long time in blue screen

When my MacBook Air boots from the internal hard disk, it spends 30 s hanging on the blue screen. This seem excessive. When I boot it from an external hard disk, it spends 1-2s on the blue screen. In itself it doesn't bother me, but I worry it's a symptom of some bigger problem.
Background: my hard disk broke, Apple installed a new hard disk, and I reinstalled from a TM backup using migration assistant. Everything works fine, I checked the new hard disk using disk util. Only the long blue screen pause seems out of sorts. Could some junk have come over when I used migration assistant? How could I identify it?

Hi
This is usually caused by a StartUp Item, Launch Daemon or Launch Agent. Try a Safe Boot, to see if it makes a difference. If so, then have a look in the following folders:
/Library/LaunchAgents/
/Library/LaunchDaemons/
/Library/StartupItems
Taylor

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