These are the changes of ARK: Survival Evolved’s Patch 180.3, grouped into categories for clarity. If not otherwise indicated, they’re quoted from the relevant Steam Thread.

Performance

• +25% GPU Perf gains. Yes, we had the GPU’s idling about 20-25% of the time due to a driver bug. You’re gonna enjoy this 🙂

(Original Announcement on Steam)

Here are the patchnotes of the previous patch (180.2)