React's Virtual DOM reconciliation process minimises unnecessary UI updates, ensuring optimal performance.

Actually, it's been demonstrated that React's UI updates are far from optimal. You can see demonstration and code here.

Svelte's mechanism works better on smaller projects but for high-scale projects React performs better.

I have seen this sentence in several articles. I will ask you the same question I asked other authors: Do you have an explicit example that demonstrates this alleged better performance?

I see you provided the link to the framework benchmarks. Is one of those indicative of this "better performance"? If yes, which one? As far as I can see, React is amongst the worst performers in the majority of categories.