Double mesh draw calls since 4.16
I have created a test project with the cool little v4.0.2, added 6k boxes with a basic material then went thru numerous builds to see how the scene performs in there.
It's actually getting wose in builds around v4.8.2 but then in 4.11 it sped up considerably (the performance build), and it stays kind of the same speed all the way up to 4.15.
In 4.16 (and 4.17 preview 1) the rendering times will increase from 10.8msec to 13msec however! That's a little over 2msec loss while rendering the same 6k boxes. In the stat scenerendering i did noticed the mesh draw calls got twice that many (for no apparent reason) which means the engine is actually rendering certain things twice. Or the stats gone wrong, but the slow down is still can be noticed!
Why is this? What happened? The test machine is win7 64bit, and a 1070gtx card.
Here are the screenshots from 4.15.0 and 4.17 p1. Same scene, made in v4.0.2 opened in both engine versions for the comparison.
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