[XPRO3 OVF vs EVF + vs XT3 Startup Time]

Is there a startup time difference between OVF and EVF on the XPRO3? I have the XT3 and wonder if there's a noticable difference between startup times between XT3 EVF and XPRO3 OVF. 

Fujifilm website says XPRO3 startup is 0.4s vs XT3 0.3s but wondering about real-world experience and if there's a timing benefit to OVF.

[White-out EVF]

I'm experiencing a white-out every now and then in my EVF on the XT3 (as if it's an extremely overexposed image). It takes it a second or two to snap out of it. I'm trying to figure out how to consistently replicate the issue. It seems to happen after I release the back-button focus and/or the shutter button. It seems to happen while in AF-C. I'm trying to figure out if it has something to do with auto-ISO or some other setting. I'm trying to figure out if it has something to do with moving from extreme light to dark (or vice versa). Maybe it's the lens (23mm f2). Again, trying to replicate it but nothing certain yet. It happens often enough to bug me. Fuji USA repair says they've never heard of this happening and that I should send the camera in for a look. Has anyone out there experienced this?

Thanks.