The installation instructions of TelemetryDeck for a website are:
<script
src="https://cdn.telemetrydeck.com/websdk/telemetrydeck.min.js"
data-app-id="<YOUR APP ID>"
></script>
This means that downloading the TelemetryDeck SDK is blocking the browser. Shouldn't async be used to tell the browser to download the script in parallel with the rest of the page? Or am I missing something because I don't think that TelemetryDeck need to block the rendering of your page?
<script async
src="https://cdn.telemetrydeck.com/websdk/telemetrydeck.min.js"
data-app-id="<YOUR APP ID>"
></script>
See the documentation here: