VueJS2 - Lose event and reload images after initializing - performance issue

I’m using VueJS as a libnary, not a SPA. I’m facing with the flashing images issue.
I delay starting VueApp after few seconds. After VueApp is initialized, all images is reloaded again and all old registered event functions is lost.

Why do I have to delay starting VueApp?
=> Because VueJS takes much CPU while initializing. I use Lighthouse in devtool to measure the performance. And the score increases from 80 to 96 after I turn off VueJS. So I do not want to initialize VueApp imediately

How to avoid that issue? Or how to prevent VueJS from rerendering some blocks?