Creating a wiki from flavor is significantly slower on XWiki 12.10.8 than on 11.10.13

STEPS TO REPRODUCE

1. Open a fresh instance of XWiki 11.10.13
2. Go to Wiki Index and create a wiki from flavor 
3. After it was created, get the time spent from the job (</rootStep> in <permdir>/jobs/status/wikicreation/createandinstall/<wikiname>/status.xml)
4. Repeat the same process on a fresh instance of XWiki 12.10.8

EXPECTED RESULTS

The time taken to create a wiki in both versions is about the same (or even better on XWiki 12.10.8).

ACTUAL RESULTS

The time required to create a wiki on XWiki 12.10.8 is much higher than on XWiki 11.10.13.

Here are the values obtained in my tests (test run 5 times, selected lowest value):

• on 12.10.8: 22922654000 nanoseconds
• on 11.10.13: 17088538500 nanoseconds

See https://test.xwiki.org/xwiki/bin/view/Performances/Jetty%20HSQLDB%20single%20wiki%20111013%20to%2012108 (Oracle JDK 11.0.11)