App slow on second launch

Hello, our app is performing perfectly on the first launch.

But when we exit the app and launch again, it is extremely slow, UI renders very slowly, all pages/components when navigating to for the first time is extremely slow but gets normal once it is loaded.

Project is based on ionic 5 and cordova with angular9, we have tried updating to angular16, ionic6 and it does nothing to fix this. Some has said it has got to do something with webview, we have also tried their given solutions like enabling/disabling hardware/software acceleration, but no fix till now.

Note: After 1st launch and exit, if we clear all the app storage and launch again as first time, it is back to normal. Also, this issue is not there on emulator, only physical devices

Please help.