How do I tell if a game will run smoothly on mobile?

Of course, the alternative would be to test it on a mobile phone, but I want to know what's considered 'safe' before the ideas become too complex to implement. So I had the following questions in mind...

What are some things to look out for when considering whether it will run smoothly or not?
What are the norms these days for minimum requirements on mobile for a game? (mine is an arcade)

Any additional information is appreciated.

Thanks in advance!

Eliclax

[Ashley]

The only way to know for sure is to test on a real device. Things like CPU and GPU power cannot be accurately simulated.