Performance degradation after migrating from WiX v5.0.2 to WiX v6.0.2

[kalyani1217]

Hi @robmen,

We have a custom Bootstrapper Application (BA) and recently migrated our installer from WiX v5.0.2 to WiX v6.0.2.

After the migration, we observed a noticeable performance degradation during startup. Specifically:

• There have been no changes to our custom BA implementation.
• When the user launches the setup, the Splash Screen appears as expected.
• However, there is now an additional ~10-second delay between the Splash Screen and the setup UI being launched.
• The same installer built with WiX v5.0.2 does not exhibit this delay.

We are trying to understand whether there are any known changes in Burn, bootstrapper initialization, dependency loading, security checks, or other startup-related behavior introduced in WiX v6 that could explain this increase in startup time.

Any insights would be greatly appreciated.

[robmen]

A bundle log file would be the place to start to see where the time is being spent.