4.26 performance

[Camta005]

I’ve been looking at this today and it definitely gives a good performance boost in 4.26 for DX11

Just note for a shipping build you have to execute the console command at runtime(in a blueprint for example), you can’t just add it to an .ini file

There is some info I found in this thread that gives a few clues as to what happened:

What is the RHI thread?What is the difference between RHI thread and rendering thread

Hi,all, currently ,I am trying to read the source code of UE4.6.1. when I gone through the code regarding rendering, beside the rendering thread,I have found there is a thread called RHI thread with its own command list.I have read the document about the “graphic programming”.but it say nothing about it,is there some one can tell me the role of RHI thread and difference between RHI thread and Rendering Thread? Thanks in advance!

So what it seems happened is the RHIThread was previously enabled by default to help performance in DX11 but was setup differently for DX12 and was set to off by default in 4.26. So you either need to use DX12 or for DX11 you have to enable RHIThread manually.