First experiment rendering HyperGrass in real-time with UE4. This scene runs smoothly around 65FPS at 1080p. It contains ~200,000 foliage instances of 68 unique high-poly grass meshes and one dynamic light. Opacity is not used and there is no overdraw, this is pure geometry instancing and UE4 does an amazing job.

System Specs - UE4 v4.22.3, CPU i7 3930K 3.2Ghz, GPU Asus Strix 1080Ti