WiTHS4UC3: Have you studied every post in this thread? Are you sure you are seeing exactly the same issue? Make sure you measure the DPC latency as described in this thread. 99% of DPC bottleneck issues are due to flaws/bugs in driver software, and don't need a BIOS update.
If you are sure, and the latest BIOS does not resolve the issue for you, I can only guess that your laptop model suffers from the same issue (system driver bottleneck because of BIOS bug), and that HP has not released the same BIOS update for your laptop model. In that case, perhaps you can get help on this forum.