Why does build lighting hang for 30 seconds before starting?

Since we’re here on the topic of light builds… Does anyone know what this is about?:

13:41:07: Failed to determine engine directory: Defaulting to …/…/…/Engine/
13:41:07: Failed to load ‘aqProf.dll’ (GetLastError=126)
13:41:07: File ‘aqProf.dll’ does not exist
13:41:07: Failed to load ‘VtuneApi.dll’ (GetLastError=126)
13:41:07: File ‘VtuneApi.dll’ does not exist
13:41:07: Failed to load ‘VtuneApi32e.dll’ (GetLastError