分析Python网站访问速度问题，优化代码实现快速响应。

import asyncio
from aiohttp import ClientSession

async def fetch(url):
    async with ClientSession() as session:
        async with session.get(url) as response:
            return await response.text()

async def main():
    urls = ['http://example.com', 'http://example.org']
    tasks = []
    for url in urls:
        tasks.append(asyncio.create_task(fetch(url)))
    responses = await asyncio.gather(*tasks)
    print(responses)

asyncio.run(main())

import redis

def get_data_from_cache(key):
    r = redis.Redis(host='localhost', port=6379, db=0)
    data = r.get(key)
    if data:
        return data
    else:
        # 如果缓存中不存在数据，则从数据库中获取
        data = get_data_from_database(key)
        r.set(key, data)
        return data

import sqlite3

def query_data_from_database():
    conn = sqlite3.connect('example.db')
    c = conn.cursor()
    c.execute("SELECT * FROM table")
    data = c.fetchall()
    conn.close()
    return data

def get_large_list():
    return (x for x in range(1000000))

def process_data(data):
    for item in data:
        # 处理数据
        pass

data = get_large_list()
process_data(data)