I'm curious as to how you came to that conclusion. Did you run any tests, or is it just a general observation? What's your computer hardware like? This isn't an accusation of anything, I promise I'm genuinely curious.

I've not done proper scientific comparisons, but had to reimplement some games as websites to make them reliably perform on Raspberry Pi's we used embedded.

This is a bit of an apples to oranges scenario, because the algorithm and architecture is not exactly the same, despite the game functioning identical.

The main weak points of LÖVE that we hit were mainly around embedded video playback though, which is probably very well optimized in chromium.

I dunno if this is what you were seeing, but LuaJIT has some serious performance issues on ARM.

https://love2d.org/forums/viewtopic.php?t=94760

It's unfortunate as Love2D is generally VERY snappy on x86. I used it on a 300MHz laptop back in the day.