[Vuejs]-How to avoid the flash out caused by Javascript latency when page loading on Chrome?

I don’t know the exact problem with this lib, but

Try using css to cover-up items that are being built visibility:hidden or maybe even display:none.
Or to still show some progress but somewhat lessen the effect – screen overlay (top-level div with position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.7); /* fourth alpha marks how dark the overlay is – the closer to 1 the darker */)