I'm using the Simply Optimized modpack plus this mod, you can see my GPU and stuff in the screenshot. my actual render distance is 4 and then adding the 128 chunks from the mod, it gets me around 140-160 fps
You can actually bump it up to 256 or 512 without a huge perf drain depending on your setup, distant horizon doesn't use the normal game renderer... You do give up shaders for it...