Low-end devices optimizations

[Flakky (Alexander Blintsov)]

@Ninjin;679290

But what exactly is so heavy? Obviously there is overhead if you use actor classes that have network prebuild, but after you initialized the objects, Unreal compared to Unity is using pass by reference with these actor classes, so reading/ writing shouldn’t be heavy at all when talking about the Gamethread. I also thought the renderer for mobile works different, also textures etc. are packed differently. Does anyone here with great knowledge can exactly say why Unreal is soooo heavy? I’m really curious about some facts <3.

In my opinion, geometry render and shaders are too heavy for low-end mobile. In my game I do not have any lighting, any complex shaders (all unlit), there are no textures.

As you can see on screenshots, I do not have anything… Like 40k polys and unlit shading, that is all… But I get 20 fps. So it must be a polycount or shader bottleneck.

I have noticed, that pure unlit shader without any material logic gives me like 20 instructions… In real shader it should be like 1 instruction for return a flat color.
just

return float3(1.0,1.0,1.0);

There is somthing unreal adds to shaders. We all know about PBR, but unlit is just a color, there should be no heavy stuff. I’m trying to get deeper in unreal shader code to see, what they done there. Maybe if i’m lucky to remove those instructions, I could get a boost to game performance.