Performance issues



My app was working fine until yesterday, but today it started some big performance issues, it sometimes takes 10 seconds for an ion-list to load, or even a tab to be highlighted.
Sometimes it works fine, with no performance issues, but it is very rare.
Ionic info
cli packages:

@ionic/cli-utils  : 1.18.0
ionic (Ionic CLI) : 3.18.0

global packages:

cordova (Cordova CLI) : 7.1.0

local packages:

@ionic/app-scripts : 3.1.0
Cordova Platforms  : none
Ionic Framework    : ionic-angular 3.9.2


Node : v8.7.0
npm  : 5.4.2
OS   : Windows 10

Environment Variables:

ANDROID_HOME : not set


backend : pro