There is no definitive answer as to whether page builders slow down WordPress. Some page builders are designed to be as lightweight as possible, while others may have more features and take longer to load.
Ultimately, the speed of your WordPress site will largely depend on your hosting provider, the type of WordPress you are using, and your specific page builder settings.
Overall, while page builders may slow down your WordPress site, they can also help you to create more custom and efficient pages. If you find that your site is becoming sluggish after installing a page builder, try adjusting its settings or switching to a different builder.
In the end, the most important factor is to test out different builders to see which one works best for you.