Ionic app is very slow

Hello…When i run ionic application in iOS and Android device.The performance of application is very slow, even though i click menu page change there is delay to change selected page.

The performance of old Android devices might be poor, but try to make a release build by building the app with the flags and see if the app is faster:

ionic cordova build android --prod --release

In most cases this dramatically improves the performance of the Ionic app!

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Make sure the for loop array is not being mooted in real time, this causes reloading of the loop without stopping