Performance stays on par with the Z Fold 3 and the Z Flip 4 also has the new profile.
Samsung Galaxy Z Fold 4's Light vs Standard performance profile benchmarks
On top of that, benchmarking the Light profile against the Standard one on the Galaxy Z Fold 4 shows that Samsung's new performance restrictions bring about 20%"lighter" benchmark scores compared to the Standard mode. Needless to say, this comes at the expense of some clever throttling and performance optimization when needed, as the benchmarks of the two profiles pitted against each other below attest to.In fact, you can expect to gain the equivalent increase in battery life due to the processor throttling of the powerful Cortex-X2 core in Snapdragon 8+ Gen1 which is as mighty as it is heat producing when pushed to its limits in our subjective impressions from the foldable phone.
This is especially true in the case of the Galaxy Z Flip 4 whose thin and elegant frame doesn't allow for stellar heat dissipation, so you are left with a whole lot of throttling anyway as you can see from our 3D gaming battery test which is the only area where it gave way to the Z Flip 3's battery life. Put it in the new Light performance mode, though, and the universe will be back in a state of equilibrium.