first call to cognito method is slow

Hi, the first call to the two methods below is very slow and after the same calls become fast. do you know why ? Method 1: var user = new CognitoUser(...) AuthFlowResponse resp = await user.StartWithCustomAuthAsync(new InitiateCustomAuthRequest()....)

Method 2: RespondToAuthChalengeResponse verresponse = await provider.ResponseToAuthChallengeAsync(new RespondToAuthChalenge(){...}) thank you in advance best regards