TechPowerUp notes that this Gen12 iGPU will likely be 40 percent faster than the best iGPU currently has.
The Gen12 iGPU that was benchmarked increases the EU count by 33% compared to Intel's top performing iGPU - add to that performance increases through the "extensive architecture rework", and we could be looking at an Intel iGPU part that achieves some 40% (speculative) better performance than their current best performer. The part was clocked at 1.1 GHz - and the Iris Pro P580 also clocked to that maximum clock under the best Boost conditions.