Specs shouldn't matter. I'm running on a crappy $300 laptop and settings is maxed with the max possible resolution, it's just a visual novel with prerendered images. . .
Spec do mater on this type of VN because it is very heavy in the video part, my GTX 980 Ti fps is only 5 on most frames in this vn.
Most older laptops can not handle this VN.
I have a Gaming Dell XPS laptop with GT 7800 m video card and it can not handle this VN at all.
To add to a1fox3's comment, my old machine had to run almost all my games for about a year, and that included using the graphics card from my current one, an R9-270 OC, with an i3-530 and 4GB DDR3 RAM and no SSDs.
Current rig is the same graphics card, an FX-6330 with 8GB DDR3 RAM and two SSDs and 1 HDD.
The older machine could run BB fine
after it took a while of sitting with a white window before the menu would actually appear after 20-30 seconds.
Current machine doesn't have that issue, and as you can plainly see it's far from even the modern mid-range of PC hardware.