Thank you for the report. It's definitely an interesting test case, and I can confirm the iframes do load much later in Firefox. If let me know if you have time to dig into this. I've uploaded a Firefox profile for my run: https://share.firefox.dev/3OVLOYj The page is very resource heavy, so if we don't see any things we might be doing wrong, it could be a prioritization issue, in which case we should look at what Chrome is doing better.
Bug 1881801 Comment 2 Edit History
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Thank you for the report. It's definitely an interesting test case, and I can confirm the iframes do load much later in Firefox. If let me know if you have time to dig into this. I've uploaded a Firefox profile for my run: https://share.firefox.dev/3OVLOYj The page is very resource heavy, so if we don't see any things we might be doing wrong, it could be a prioritization issue, in which case we should look at what Chrome is doing better. I've captured a perf profile in Chrome too. [link here](https://drive.google.com/drive/folders/1JZSRQJHB6ksbgae0dQp-0NdwqwtcowtW?usp=sharing)