Greetings @user3507 and welcome to Elfsight Community 
I’m so sorry that our widget affects your website’s PageSpeed score. However, the good news is that we have a way of improving the performance.
You are very welcome to reinstall your widget by using some kind of lazy loading.
To make it work, you need to add a data-elfsight-app-lazy attribute to the widget installation code. Here’s what the installation code will look like:
<script src="https://apps.elfsight.com/p/platform.js" defer></script>
<div class="elfsight-app-WIDGET_ID" data-elfsight-app-lazy="first-activity"></div>
Please replace WIDGET_ID in the code above with the ID of your own widget and install it on your website.
Just in case, here is the post, where you’ll find more details about lazy loading feature.
Please follow these steps and let me know if it worked 