这可能是因为Lambda函数在“冷启动”期间需要更长时间来启动。为了解决此问题，您可以在Lambda函数中添加一个Scheduled Event，每隔一段时间触发一次lambda函数，以便在调用Lambda函数之前保持Lambda函数处于活动状态，从而避免冷启动带来的延迟。

以下是一个Node.js代码示例，每隔5分钟触发一次Lambda函数：

exports.handler = async (event) => {
    console.log('Running the Lambda function');
    // Your code goes here
    return 'Done';
};

// Schedule the Lambda function to run every 5 minutes
const AWS = require('aws-sdk');
const CloudWatchEvents = new AWS.CloudWatchEvents();
const ruleName = 'RunLambdaFunctionEvery5Minutes';
exports.scheduleLambda = async (event) => {
    try {
        await CloudWatchEvents.putRule({
            Name: ruleName,
            ScheduleExpression: 'rate(5 minutes)'
        }).promise();

        const lambdaArn = process.env.AWS_LAMBDA_FUNCTION_NAME;
        const lambdaTarget = `arn:aws:lambda:${process.env.AWS_REGION}:${process.env.AWS_ACCOUNT_ID}:function:${lambdaArn}`;
        await CloudWatchEvents.putTargets({
            Rule: ruleName,
            Targets: [
                {
                    Arn: lambdaTarget,
                    Id: '1'
                }
            ]
        }).promise();
    } catch (error) {
        console.error(error);
        throw error;
    }
};