[Rohansi]

I disagree. Yes, it's less time vs. C but still a long time.

There are plenty of games built with Lua that run very well such as Balatro and Don't Starve. And games are far more sensitive to hitches than GUI projects because they are constantly animating. Your users will not only easily see lag - it can ruin the game for them.

If a basic GUI is performing poorly then the blame almost certainly lies on whoever developed it. Don't blame the language or runtime.