如何优化Python网站访问速度，提升用户体验？

from django.core.cache import cachedef index(request):    key = 'index_content'    content = cache.get(key)    if not content:        # 从数据库或其他地方获取网页内容        content = get_index_content()        # 将网页内容存储在缓存中，有效期为一小时        cache.set(key, content, 3600)    return HttpResponse(content)

from celery import Celeryapp = Celery('tasks', broker='redis://localhost:6379/0')@app.taskdef send_email(to, subject, body):    # 发送电子邮件的代码@app.taskdef process_image(image):    # 处理图像的代码

def send_email_view(request):    to = request.GET.get('to')    subject = request.GET.get('subject')    body = request.GET.get('body')    send_email.delay(to, subject, body)    return HttpResponse('Email sent successfully.')def process_image_view(request):    image = request.FILES.get('image')    process_image.delay(image)    return HttpResponse('Image processed successfully.')

from django.core.cache import cachedef get_user_by_id(user_id):    key = f'user_{user_id}'    user = cache.get(key)    if not user:        # 从数据库中获取用户信息        user = User.objects.get(id=user_id)        # 将用户信息存储在缓存中，有效期为一小时        cache.set(key, user, 3600)    return user

import asyncioasync def fetch(url):    # 发起HTTP请求的代码async def main():    urls = [...]    tasks = [fetch(url) for url in urls]    await asyncio.wait(tasks)if __name__ == "__main__":    loop = asyncio.get_event_loop()    loop.run_until_complete(main())