title: Does using scrapy-splash significantly affect scraping speed?
body: <p>So far, I have been using just scrapy and writing custom classes to deal with websites using ajax.</p>
  
  <p>But if I were to use scrapy-splash, which from what I understand, scrapes the rendered html after javascript, will the speed of my crawler be affected significantly?</p>
  
  <p>What would be the comparison between time it takes to scrape a vanilla html page with scrapy vs javascript rendered html with scrapy-splash?</p>
  
  <p>And lastly, how do scrapy-splash and Selenium compare?</p>