Improve RecycleList performance for big amounts of items

I traced the performance of a recycle list with 100.000 items and found that the check for expired items for updateVisibleItems(true):
https://github.com/Akryum/vue-virtual-scroller/blob/e4b28fa5dc14add1ba45e378d538656cd9de4959/src/components/RecycleScroller.vue#L392

takes a lot of time, especially for rendering the bottom part of a list similar to what you experience in Chat views (higher indexes, longer search). For my case it would be enough to introduce a new prop that declares the items list as readonly and skips the check. What do you think?