Launching application via Java Web Start is much slower since 1.8.0_31

FULL PRODUCT VERSION :
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
We are launching our application via Java Web Start. We noticed that it takes much longer since update 8u31. It seems that the web start mechanism verifies the jnlp and each included jar for every start. The caching does not seem to work. Furthermore does the verification of our signature take a lot of time.

REGRESSION. Last worked in version 8u25

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Start application via Java Web Start from "https://adam.lucanet.com/jnlp/jnlpfile/client/x_adam"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Fast startup of the application.
ACTUAL -
Some starts of the application take up to 30 minutes.

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Using an older version of Java than 8u31.

SUPPORT :
YES