Dynamo DB taking long time to fetch record with high latency up to 5-6 second

pom.xml

<dependency>
    <groupId>com.amazonaws</groupId>
    <artifactId>aws-java-sdk-bom</artifactId>
    <version>1.11.256</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>
<dependency>
    <groupId>com.amazonaws</groupId>
    <artifactId>aws-java-sdk-dynamodb</artifactId>
</dependency>

Client Code

public static AmazonDynamoDB getDynamoDBClient() {
        return AmazonDynamoDBClientBuilder.standard().withRegion("ap-southeast-1").build();
}

Now i am trying to execute a normal query having few records but it is taking long time to fetch the result.

For first time it is fetching the records in around 5-6 seconds on multiple requests in reduces by half. 2-3 seconds is still large time for fetching only few items.

Already checked the tuning of dynamo DB using different client configurations (connection timeout, request timeout, retry etc.) but not giving results as expected. Also checked with SDK version 2 URLConnectionHTTPClient config but same results came there too.

One possible cause can be the credentials fetch time for dynamo DB client but not having any credentials caching reference in java. Can any one suggest possible configuration to improve this latency.