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These 1-page example pages are pretty heavy: https://developers.google.com/speed/pagespeed/insights/?url=...

17 on Page Speed Insights. Lots of background scripts or something?

And using PNG as their image format and not doing any kind of text compression. That’s the most basic thing in serving websites and they are not doing it.

what image format should they be using?

https://www.keycdn.com/support/png-to-webp

WebP could be a good option.

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