im learning by my self how to create a reddit bot and working with API in Python, but my code is very slow. im trying to download multiple posts and their comments in order to save them and look for connections between keywords, but from what I found out im only sending a single request in every API request. how can I make this code/bot faster and be able to handle hundreds of posts at a time?

here is what im working with (removed some info and the subreddits names):

import praw
import time
import pandas as pd 
import csv


reddit = praw.Reddit(client_id=<client_id>,
                     client_secret=<secret>,
                     user_agent="<Bot>",
                     check_for_async=False,
                     username=<user>,
                     password=<password>)

reddit.user.me()

subreddit = reddit.subreddit("....")

data = {
        'PostID': [],
        'Title': [],
        'Text': [],
        'Auther': [],
        'Comments': []}
df = pd.DataFrame(data)

def getComments(submission):
    for comment in submission.comments.list():
        postID = submission.id
        commnetAuthorID = comment.author.id
        commentText = comment.body
        author = "Deleted_User"
        if comment.author is not None:
            author = comment.author.name

        addToFile('comments.csv', [postID, commnetAuthorID, author, commentText])

def newPost(postTo = '...'):
    subReddit = reddit.subreddit(postTo)
    postTitle = "This is a test post"
    postText = "Hi, this is a post created by a bot using the PRAW library in Python :)"
    subReddit.submit(title = postTitle, selftext = postText)

def addToFile(file, what, operation = 'a'):
    csv.writer(open(file, operation, newline='', encoding='UTF-8')).writerow(what)


addToFile('post.csv', ['PostID', 'AuthorID', 'AuthorName', 'Title', 'Text'], 'w')
addToFile('comments.csv', ['PostID', 'AuthorID', 'AuthorName', 'Text'], 'w')
for post in subreddit.new(limit=1000):

    submission = reddit.submission(id=post.id)
    submission.comments.replace_more(limit=None)
    getComments(submission)


    author = "Deleted_User"
    if post.author is not None:
        author = post.author.name

    addToFile('post.csv', [post.id, post.author.id ,author, post.title, post.selftext])