Game laggy

Hi I made a game with Ionic, when I run it on my laptop, it’s very smooth, but when I run it on my phone, it’s laggy, how can I make it faster and not laggy?

Just to make it clear, the modal animation is very laggy, and some background animation is laggy as well, but not as apparent.

We are going to need a lot more information than this.

Are you using elements or a canvas?
What devices are you testing on?

A consumer phone is not as powerful as a computer so you should develop for the phone in mind first.