How to speed up the translate service in ionic 2

this is my code

import {TranslateService} from '@ngx-translate/core';

export class MyApp {

public translate: any;

 constructor(translate: TranslateService)
{
this.translate = translate;
      translate.addLangs(["en", "ar"]);
      LogDetails.language = translate.getBrowserLang();
      console.log("setting language", LogDetails.language);
      translate.setDefaultLang(LogDetails.language);
}

My language translate is working only after the 30 seconds of app start,
How to resolve this issue ?

How does it take 30 seconds? Do you see the English version first, then the correct language? Or what is happening?

translate.use(LogDetails.language);

is missing

No. it takes exactly 30sec to apply the language in HTML page

my default language is depend on the device,
when i change the language it takes 30secs to apply the changes in page

Did you remote debug the problem on the device already?
Follow these instructions here to debug the problem in Safari dev tools:
https://ionic.zone/debug/remote-debug-your-app#ios
Follow these instructions here to debug the problem in Chrome dev tools:
https://ionic.zone/debug/remote-debug-your-app#android
Look at the console and network tabs for errors and what is happening during these 30 seconds.