Degraded iFrame performance in Chrome

Hi,

We have a noted a serious drop in performance embedding PlayCanvas builds with an iFrame. Loading times are taking extremely long or failing all together, typically causing the browser to show the page is unresponsive dialog. This is not a problem on mobile, seemingly only on desktop. Edge, Safari, Firefox, and Brave, all perform fine.

Any ideas about what this could be? Completely stumped at the moment.

Thanks

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