<t>"inference engine" it's just the part of the software you wrote which detect the cursor or an object is getting very close to a particular object (wall, corner, furniture, etc).<br/>
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You use it everywhere in SW3D to show the small blue disk when you draw rooms, to display rules when the ...

<t>Much better thanks. I still have latency with the "Create room" feature. Here is what happens:<br/>
1. Put the mouse cursor on a corner and wait for the inference engine to display the small blue disk<br/>
2. Then click<br/>
3. Move to another corner and ...(step 1)<br/>
4. Click<br/>
5. Move the ...

<t>I updated my (Dell XPS 13 with Skylake Core i7) to Fedora 25 and SW3D performances are so awful that it is barely usable. And as my VirtualBox Windows VMs crash because of the 3D rendering, it's difficult for me to use SW3D.<br/>
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I tested with both Xorg and Wayland, same awful graphics ...

Some more elements. I also have a 2013 XPS13 which runs an Intel Ivy Bridge. This PC was also upgraded from F23 to F24 and SW3D runs perfectly.

So, the issue seems to be around GPU support obviously.

Same problem here on a XPS13 (Skylake processor), so not exotic GPU, pure Intel, on Fedora 23 and 24, 64 bit.