一种解决方法是使用自动伸缩组（Auto Scaling Group）来管理EC2实例。通过自动伸缩组，您可以根据负载需求自动增加或减少EC2实例的数量，以确保系统的可用性和性能。

以下是一个使用AWS SDK for Python（Boto3）创建自动伸缩组的代码示例：

import boto3

# 创建Auto Scaling Group
def create_auto_scaling_group():
    client = boto3.client('autoscaling')

    response = client.create_auto_scaling_group(
        AutoScalingGroupName='my-auto-scaling-group',
        LaunchConfigurationName='my-launch-configuration',
        MinSize=1,
        MaxSize=10,
        DesiredCapacity=1,
        AvailabilityZones=['us-west-2a'],
        HealthCheckType='ELB',
        HealthCheckGracePeriod=300
    )

# 创建Launch Configuration
def create_launch_configuration():
    client = boto3.client('autoscaling')

    response = client.create_launch_configuration(
        LaunchConfigurationName='my-launch-configuration',
        ImageId='ami-12345678',
        InstanceType='t2.micro',
        KeyName='my-key-pair',
        SecurityGroups=['my-security-group'],
        UserData='#!/bin/bash\n\n# 用户数据脚本',
        InstanceMonitoring={
            'Enabled': False
        },
        EbsOptimized=False,
        AssociatePublicIpAddress=True
    )

# 创建负载均衡器（Load Balancer）
def create_load_balancer():
    client = boto3.client('elbv2')

    response = client.create_load_balancer(
        Name='my-load-balancer',
        Subnets=['subnet-12345678', 'subnet-87654321'],
        SecurityGroups=['my-security-group']
    )

# 创建目标组（Target Group）
def create_target_group():
    client = boto3.client('elbv2')

    response = client.create_target_group(
        Name='my-target-group',
        Protocol='HTTP',
        Port=80,
        VpcId='vpc-12345678'
    )

# 将目标组与负载均衡器关联
def register_targets():
    client = boto3.client('elbv2')

    response = client.register_targets(
        TargetGroupArn='arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-target-group/1234567890123456',
        Targets=[
            {
                'Id': 'i-12345678',
                'Port': 80
            },
        ]
    )

# 创建负载均衡监听规则
def create_listener():
    client = boto3.client('elbv2')

    response = client.create_listener(
        LoadBalancerArn='arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/1234567890123456',
        Protocol='HTTP',
        Port=80,
        DefaultActions=[
            {
                'Type': 'forward',
                'TargetGroupArn': 'arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-target-group/1234567890123456'
            },
        ]
    )

通过创建自动伸缩组、启用负载均衡器和监听规则，您可以使EC2实例在长页面加载时自动增加或减少数量，以满足需求并提高可用性。