Hello Eugene,
First of all, we do not support PDSE-2 for now.
You need to install the PTF RO92126 and RO93242 which bypass such libraries. You will need also to add into USEDSSIO parameter PV2 to activate it.
Actually if you do not have these PTFs you are archiving these data sets but they will be restored as a normal PDSE and the versionning will be lost.
I guess the performance are due to this back processing.
Please stop using it and install as quick as possible these 2 PTFs.
The PDSE.2 support is available in the release R14 which should be published next year.
If you need anything else please let me know or open a case.
Happy new Year,
Pierre