How to debug the element which slows down startup?

@WoJWoJ wrote:

I noticed that Home Assistant’s startup freezes at one point, and then resumes. I guess it is one of the components slowing it down.

How to debug this?

Setting the debug level to debug I see in the logs:

(...)
2020-02-16 20:55:40 DEBUG (MainThread) [aioharmony.hubconnector] HarmonyHub.home: Retrieving Harmony Hub information.
2020-02-16 20:55:40 DEBUG (MainThread) [aioharmony.hubconnector] HarmonyHub.home: Sending post request: {'id ': 1, 'cmd': 'setup.account?getProvisionInfo', 'params': {}}
2020-02-16 20:55:40 DEBUG (MainThread) [aiounifi.api] [{'_id': '5d656c38d02e7d00f7897a69',
  '_is_guest_by_uap': False,
  '_last_seen_by_uap': 1581882932,
  '_uptime_by_uap': 18158,
  'anomalies': 0,
  'ap_mac': 'f0:9f:c2:73:34:fe',
  'assoc_time': 1581864657,
(... dict output ...)
  'vlan': 0,
  'wifi_tx_attempts': 2022},
 {'_id': '5e1b342eb9d82100f7ae7d87',

← here is the point when the startup freezes for a minute or so

2020-02-16 20:56:10 INFO (SyncWorker_10) [homeassistant.util.package] Attempting install of semantic_version==2.8.2
2020-02-16 20:56:15 INFO (SyncWorker_4) [homeassistant.util.package] Attempting install of hacs_frontend==13
2020-02-16 20:56:20 INFO (MainThread) [homeassistant.setup] Setting up light
2020-02-16 20:56:20 INFO (MainThread) [homeassistant.components.light] Setting up light.mqtt
(...)

The freeze is not a big deal because Home assistant works great after starting up. I would however prefer to pin-point the culprit because this may mean other problems (DNS resolution for instance) which need to be fixed.

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