I'm a newbie getting into web scrapers. I've made something that works, but it takes hours and hours to get everything I need. I read something about using parallel processes to process the URLs but I have no clue how to go about it and incorporate it in what I already have. Help is much appreciated!

Here is my, still extremely messy, code. I'm still learning :)

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC 
from selenium.common.exceptions import TimeoutException
from bs4 import BeautifulSoup
from selenium.common.exceptions import NoSuchElementException
import time
import random
import pprint
import itertools
import csv
import pandas as pd

start_url = "https://www.nationalevacaturebank.nl/vacature/zoeken?query=&location=&distance=city&limit=100&sort=relevance&filters%5BcareerLevel%5D%5B%5D=Starter&filters%5BeducationLevel%5D%5B%5D=MBO"

driver = webdriver.Firefox()
driver.set_page_load_timeout(20)
driver.get(start_url)
driver.find_element_by_xpath('//*[@id="form_save"]').click() #accepts cookies

wait = WebDriverWait(driver, random.randint(1500,3200)/1000.0)
j = random.randint(1500,3200)/1000.0
time.sleep(j)
num_jobs = int(driver.find_element_by_xpath('/html/body/div[3]/div/main/div[2]/div[3]/div/header/h2/span').text)
num_pages = int(num_jobs/102)

urls = []
list_of_links = []

for i in range(num_pages+1):
        try:
            
            
            elements = wait.until(EC.presence_of_all_elements_located((By.XPATH, '//*[@id="search-results-container"]//article/job/a')))
            for i in elements:
                list_of_links.append(i.get_attribute('href'))

            j = random.randint(1500,3200)/1000.0
            time.sleep(j) 

            if 'page=3' not in driver.current_url:
                driver.find_element_by_xpath('//html/body/div[3]/div/main/div[2]/div[3]/div/paginator/div/nav[1]/ul/li[6]/a').click()
            else:
                driver.find_element_by_xpath('//html/body/div[3]/div/main/div[2]/div[3]/div/paginator/div/nav[1]/ul/li[5]/a').click()
            
            url = driver.current_url
            if url not in urls:
                print(url)
                urls.append(url)

            else:
                break
   

        except:
            continue
            
                  
set_list_of_links = list(set(list_of_links))
print(len(set_list_of_links), "results")                
driver.close()

def grouper(n, iterable):
    it = iter(iterable)
    while True:
       chunk = tuple(itertools.islice(it, n))
       if not chunk:
           return
       yield chunk
        
def remove_empty_lists(l):
    keep_going = True
    prev_l = l
    while keep_going:
        new_l = remover(prev_l)
        #are they identical objects?
        if new_l == prev_l:
            keep_going = False
        #set prev to new
        prev_l = new_l
    #return the result
    return new_l


def remover(l):
    newlist = []
    for i in l:
        if isinstance(i, list) and len(i) != 0:
            newlist.append(remover(i))
        if not isinstance(i, list):
            newlist.append(i)
    
    return newlist
    
vacatures = []
chunks = grouper(100, set_list_of_links)
chunk_count = 0

for chunk in chunks: 
    chunk_count +=1
    print(chunk_count)
    j = random.randint(1500,3200)/1000.0
    time.sleep(j)
    
    for url in chunk:

        driver = webdriver.Firefox()
        driver.set_page_load_timeout(20)
            
        try: 
            driver.get(url)
            driver.find_element_by_xpath('//*[@id="form_save"]').click() #accepts cookies

            vacature = []
            vacature.append(url)

            j = random.randint(1500,3200)/1000.0
            time.sleep(j)

            elements = driver.find_elements_by_tag_name('dl')
            p_elements = driver.find_elements_by_tag_name('p')
            li_elements = driver.find_elements_by_tag_name('li')
            
            for i in elements:
                if "Salaris:" not in i.text:
                    vacature.append(i.text)
            
            running_text = list()
            for p in p_elements:
                running_text.append(p.text)
            
            text= [''.join(running_text)]
                
            remove_ls = ['vacatures', 'carrièretips', 'help', 'inloggen', 'inschrijven', 'Bezoek website', 'YouTube',
                        'Over Nationale Vacaturebank', 'Werken bij de Persgroep', 'Persberichten', 'Autotrack', 'Tweakers',
                        'Tweakers Elect', 'ITBanen', 'Contact', 'Carrière Mentors', 'Veelgestelde vragen',
                         'Vacatures, stages en bijbanen', 'Bruto Netto Calculator', 'Salariswijzer', 'Direct vacature plaatsen',
                         'Kandidaten zoeken', 'Bekijk de webshop', 'Intermediair', 'Volg ons op Facebook']
            
            for li in li_elements:
                if li.text not in remove_ls: 
                    text.append(li.text)
            
            text = ''. join(text)
            vacature.append(text)
                        
            vacatures.append(vacature)
                    
            driver.close() 
            
        except TimeoutException as ex:
            isrunning = 0
            print("Exception has been thrown. " + str(ex))
            driver.close()
            
        except NoSuchElementException:
            continue