Example 1: With 2 characters at 4X mesh resolution running on the CPU skinning engine and 10 high-quality lights with full shadows, 2.X runs at roughly 250FPS on our high-end test system. For comparison on this same system, 1.X with physics turned off and with 2 characters at 1X mesh resolution and 8 forced pixel lights gets roughly 230FPS. In addition, this 2.X test was running post processing effects like exposure control, color correction, and tone mapping while 1.X was not as this was only possible using the popular
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plugin from @MacGruber. 2.X will essentially have PostMagic with a lot more post processing effects built in. While the baseline cost of HDRP is higher than the old rendering system used in 1.X, HDRP is more efficient at running more lights so can result in higher performance on scenes with higher quality lighting.
Example 2: With 1 character and 3 lights, 2.X runs at roughly 360FPS and 1.X runs at roughly 380FPS. Same notes as above where 2.X is running 4X resolution mesh and post process effects on top while 1.X is not.
These 2.X performance numbers are early. HDRP is still being developed and optimized. We still have a lot more to add to 2.X which will slow things down. Physics was not considered here which is the primary bottleneck in 1.X and will definitely be a large performance factor in 2.X as well as we are aiming to make skin physics more accurate and enable full body soft physics. So please don't put much stock in these early numbers. The point of this section is to show that we are optimizing for performance from the start and will ensure 2.X can run on a wide range of systems with a wide range of performance oriented user preferences.