[capableweb]

Definitely seems like alfon's solution is faster/better, as it's more accurate when the game speeds up. However, it's also more resource intensive! getBoundingClientRect (used to at least, long time I go I did browser performance stuff) forces a new layout calculation each time it's called, which is one of the most expensive things you can do in the DOM, and can lead to jank in the website. Some more information here: https://developers.google.com/web/fundamentals/performance/r...

Just adding this information for the ones who don't know and like to know more about browser performance :)

[ehsankia]

It is a bit of a slippery slope, because at some point, you could just do "GameApp.AddScore(10000)" which is clearly not playing the game. The line of what's "fair" and what's not isn't too clear. I do think staying out of the game code is actually a fairly good line though.

EDIT: Looked down thread and basically saw a bunch of examples of just that!

[afiori]

I believe that getBoundingClientRect does not force a layout calculation by itself, it only forces queued recalculations to happen synchronously.

So calling it 100 times in a loop should be fast, but calling it 100 times in a loot that also updates the DOM should be cripplingly slow.

[alfon]

Thanks for the note!