The website could be optimised. Is there a way to contribute to it?
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This forum could/should be served with https
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Optimize images on website
I already run some optimization (on desktop from 63% to 72%), but you still can optimize images, here are more infos:
https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Foscedays.org%2F&tab=mobile
Let me know if I can help!