Thanks for testing and going the info! Firefox is about 40% slower than Chromium-based browsers and Safari for us, we focus on the default browser on each platform so Firefox isn't tested often. Firefox also accounts for about 0.4% of our traffic and their performance analysis tools aren't very deep, so unfortunately it's hard to justify allocating time to improve there.

We also can't load in 2 seconds on any device we can run on. There are obviously some devices that ship Chrome on Android that can load the game, but are incredibly slow. So yes, not always 2 seconds!

Finally, we still have a huge amount of known performance we can gain in our loading, so I do hope I can come back in the future and show that 2 second loading on a lot more devices!