Delay/Flicker in View when setting State in onPageSelected

I've created a PagerView with an onPageSelected callback:

```
const [index, setIndex] = useState(0);
```

```


First page


Second page


```

```
const onPageSelected = (event) => {
const {position} = event.nativeEvent;
if(position !== index) {
setIndex(position);
}
}
```

When i change view, there is a small delay. I've traced it back to the `setIndex()` useState.
I want to use the index to show different button styles based on if it is the active view or not.

How do i get around this?
When i remove the setIndex(), its super smooth, but I dont have access to the current active page.
Can i get the current active page from the ref? Is there a better way to implement this?