Good results on Google Pagespeed insights but sometimes poor in real life?

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Hello
my website is getting very good results on google pagespeed insights.

100 SEO
100 Best practices
98 accesibility
70/95 performance on mobile/desktop

However, occasionally when I visit my website it could take up to 10 real life seconds before anything shows up, mobile or pc, sometimes it loads almost instantly.

css and js are minified, images are optimized and im using a w3 cache plugin, hosting should be fine with redis, any idea what could cause this?
Is mobile loading always slower than desktop?

Thanks.

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