This is a known issue, and a bit of a weird one. 1m and 30s sounds very long though - which version of SF are you running?

Looks like a bug when using SF on Windows. Will look into this for Beta 0.16!

Edit: This has now been fixed in Beta 0.20!

Not that I can think of at the moment. Easiest way to "solve" it at the moment would be to disable shadow receiving on the object itself

This is already possible in the menu bar on the left :)
Blending & Depth -> Face Culling -> Double Sided
(Which is the same as Off)

Depth Bias and Scene Depth are now both implemented in Alpha 0.20!


A UV-sampleable version might come later, if people want it!

This has been fixed in the upcoming version 0.20! If you want to temporarily fix it now, open the shader and uncheck light probes and/or lightmapping :)

This is now fixed in Beta 0.20 :)