OpenVino backend's speed is dissapointing.

[barolo]

I've been testing whisper.cpp+OpenVino backend with GPU [Integrated Xe GPU]. And while it makes things faster [slightly lower CPU usage with maxed threads] it only uses GPU lightly [~20-40%] and in spaced out bursts.
Recently I've checked HF whisper with their optimum+openvino gpu backend, and it's the other way around. GPU is constantly maxed out,and CPU is used slightly, it's also blazing fast, orders of magnitude faster.

What's the reason behind such discrepancies in behaviour? Is it the chunking of HF?