Start Qt Creator with enabled QbsProjectManager and open qtcreator.qbs from Creator's repository, v3.2.0. Wait until parsing the project finished and the project tree is being populated.
With a release build of Creator on my home machine this has been taking about 45 seconds since Creator 3.2. Now it takes about 75 seconds. Bisecting led me to the following change:
Please check whether you can speed this up again.
Noticed in Squish test tst_opencreator_qbs.