Performance: Eevee vs Blender Internal

Question

In my application I use Blender's Internal rendering engine (headless mode) to render quick mock-ups of various items. BI yields plenty quality, however speed is essential (it's a web app) and I wish it was faster.

I wanted to try out Eevee so I ported one of my scenes to 2.80, fixed the textures & lighting and tried rendering the scene.

The scene is very simple - two objects with a basic texture material and three (!) light sources. It renders this:

My 2.79 Blender Internal environment is run on an 8-core (2.7 GHz Intel Xeon® Platinum 8168) 16G RAM compute-optimized VM.

I tested 2.80 Eevee on a Tesla K80 6-core 56G RAM VM, which is comparable in price.

It seems that Eevee is slightly faster than BI. The difference is even more significant when multiple clients are rendering in parallel.

Unfortunately, everyone keeps comparing Eevee to Cycles and I haven't been able to find any relevant data on Eevee vs BI. My questions are thus:

1. Would one expect Eevee to be faster than BI in general? If not, under what circumstances would BI be faster?
2. Which one has more potential for optimization (e.g. reducing samples vs optimizing tile size, etc.)?

I appreciate that there are many factors in play, especially when it comes to hardware. Hopefully that does not make this question too broad.

EDIT

My scenes are here:

• Blender 2.79b (BI): http://www.filedropper.com/phone-279b
• Blender 2.81 (Eevee): http://www.filedropper.com/phone-280

I don't really have any specific requirements... Here's what I am thinking:

1. The final result should not look like it's from Counter Strike 1.6. This is what I have now, and it's fine: http://www.filedropper.com/phone_2 (yes, I am stitching two images together)
2. Potential load is not yet known, but I might want to plan for maybe 100s of people rendering at the same time...

Answer 1

I know I'm late to the party, but I'll leave this here for reference. Blender Internal is an extremely outdated engine, hence why they replaced it in 2.80 with Eevee, which is far superior in every way.

The most prominent difference between Eevee and Blender Internal is that, while Blender Internal renders offline using the CPU only when you manually go to render, Eevee is a real-time rendering engine that runs on the GPU utilizing OpenGL. This means that Eevee is significantly faster than Internal in every situation, even when rendering on the CPU. In fact, Blender 2.80's material view actually utilizes Eevee for its rendering.

Furthermore, Eevee is much easier to use and has a node-based material system identical to that of Cycles, including PBR support. (Eevee materials are actually compatible with Cycles and vice-versa.) No longer do you have to fiddle with a million settings in order to get a decent result, although optimization settings are still present and very powerful for those so inclined. But your optimization (or lack thereof) in the scene will only ever affect render times in matters of seconds, as the main bottleneck when it comes to Eevee is the time it takes Blender to save the frame to disk and queue up the next frame.

In short, use Eevee and your render times will be faster and your results will look way better.

PS: I don't actually know that much about the technical side of Blender Internal, so forgive me if I got something wrong.