We've optimised the game a lot, but that sounds like the machine you're running it on might not meet the minimum requirements, unfortunately.
I know we haven't published any minimum specs because we don't know what they are, but while it does run fine on some weaker devices we've tested like my Surface Go, if it's crashing at that point then the device you're using probably just doesn't have enough memory for it.
At that point in the game the "real" gameplay on the main screen is loading up and that's more demanding than a simple VN would be.