VR video keeps freezing in AE CC19

I'm converting a vr video (3 minutes long) with vr converter in After Effect. I shot it with Samsung360 (106 ver.). When I start editing vr master camera, it suddenly freezes everytime.

Windows 10 (x64)

Intel i7

Nvidia GeForce GTX-1070

16 RAM

Is my system not enough for the minimum requirements for editing vr videos? Or maybe the videos are too heavy?

Thank you.