adsense drop page load speed dramatically?

Question

my website home page load score is 91 that without adsense code this the code

<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- arabsdreams -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-xxxxxxxx"
     data-ad-slot="11111111"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>

when i add the code the speed score dropped to 41 using google PageSpeed Insights i tried to use the rel="preload" like that and put in header

<link rel="preload" href="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" as="script">

but ads didn't show up so the link rel="preload" didn't work with adsense code

so how can i use adsense on my website without dropping load speed