Performance in XWiki 16.10.3 is significantly lower than previous cycle in Jetty

After running some performance tests on XWiki 16.10.3 by comparing it with XWiki 15.10.16 (last version from the previous cycle - Jetty/HSQL demo packaging), most of the indicators have reported much higher time values than in previous XWiki tested versions.

The full report is available here: https://test.xwiki.org/xwiki/bin/view/Performances/Jetty%20HSQLDB%20single%20wiki%20151016%20to%2016103

The tests for both XWiki versions were run on the same environment (see more details on https://test.xwiki.org/xwiki/bin/view/Performances/Jetty%20HSQLDB%20single%20wiki%20151016%20to%2016103#HEnvironment), same configuration and in the same time period. Also, the machine's processor was monitored closely to avoid high variations.

More specific, the following indicators have significantly higher values in XWiki 16.10.3 than in XWiki 15.10.16:

• Jetty startup +13.5% slower
• Reload of not existing page without UI: +42.16% slower
• Reload of not existing page with UI: +145.49% slower
• Reload of empty page without UI: +211.91% slower
• Reload of empty page with UI: +158.39% slower
• Reload of Main.WebHome without UI: +156.98% slower
• Reload of Main.WebHome with UI: +151.83% slower
• SOLR sync when index is empty: +55.66% slower
• SOLR sync when there is nothing to do: +35.97% slower
• Result of search finding lots of results: +89.11% slower
• Result of search finding one result: +119.65% slower
• Rendering of a page with 1000 macros without UI: +69.24% slower
• Rendering of a page with 1000 html macros without UI: +22.11% slower
• Wiki creation from flavor: +27.31% slower

The full details are available in the Performance report.

Although not mentioned in the report, I've also validated some test results with JMeter (5.6.3) and I got consistent results than the tests run with dumbbench.

The Peformance tests results from previous year (comaring XWiki 15.10.4 to 14.10.20) is available here: https://test.xwiki.org/xwiki/bin/view/Performances/Jetty%20HSQLDB%20single%20wiki%20141020%20to%2015104