On iOS 10 cognitoUser.authenticateUser freezes the screen and consume 100% of the CPU

[lalcaraz]

Hi There!

I'm implementing on Ionic (angular1) for iOS and when I use this method (cognitoUser.authenticateUser) the CPU goes up to 100%, the screen freezes and after 10 seconds everything unclogs and continues as normal. This does not happen with any other method.

Any idea? It does not happen on Android by the way.

Thanks in advance for your help.

[pmantaj]

Hi @lalcaraz

It could be the problem with the jsbn2 lib and the bnModPow method. Please, check out the issues:

• AWS Authentication very slow on iOS Phonegap app amazon-archives/amazon-cognito-identity-js#209
• Performance issue with hybrid mobile apps amazon-archives/amazon-cognito-identity-js#69
• CognitoUser.authenticateUser don't work properly. amazon-archives/amazon-cognito-identity-js#179

[mcrider]

I'm also having major issues, which seem to be with BigInteger (i.e., the modPow function) since updating npm -- calling authenticateUser consistently causes Chrome to crash. I've downgraded to 1.8.0 for now to get things working again.

[lukezbikowski]

Same here w/ ionic2. Any good solution (with using aws-sdk-js) ?

[lukezbikowski]

If you use cordova - problem is not appearing in WKWebView. That is the best solution I have found for now (unless you want to go with ADMIN_NO_SRP_AUTH).

[kfukuyama]

Not sure if this is the proper place to say, but I'm experiencing extremely slow performance with IE11 and can confirm it's slow in bnModPow of the BigInteger implementation. Chrome and Edge are at least working fine. I wonder if anybody else is having the same experience. (using 1.17.0 )