This commit for PDI-18528 causes PDI to retry loading XML files after a failure. Each retry is given a 1 second pause. Since PDI loads XML files internally for all sorts of stuff, this can cause unexpected delays.
This can cause unneeded delay in the case where the file does not exist.
The "Use Simple Concat mapping" transformation in samples can be used to reproduce. Running it results in a prolonged pause during the "dispatching" phase. If you then create this file:
and add any valid XML to plugin.xml, the transformation will run without a delay.