I ran a Google Pagespeed score, and the results were a bit low on mobile. I’m not sure what impact this will have on core vitals, but I was wondering if there is some way to optimise this? I’m using Ghost Pro hosted service
Most of those points are theme related. You may look for a custom theme that is better on handling those topics.
An item is related with very short browser cache TTLs for Ghost apps (portal, search etc.). Recently I was working on it and here a GitHub thread that we discussed and I shared my workarounds: Portal and Sodo-Search scripts are not leveraging browser cache efficiently · Issue #25021 · TryGhost/Ghost · GitHub
Thanks, but the theme developer suggests that these are mostly server-related!
I would like to hear some server related items in this list as an example. 
I checked the list again but they are about:
- Deliver CSS, JS and image files efficiently.
- Reduce blocking scripts/styles on page load.
- Avoid layout shift, by properly styling images and custom fonts.
Server has to be fast to deliver HTML and other files. But nothing mentioned in the list about slow response.
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It’s 6am and the 
woke me up, so here you go:
Your theme isn’t doing anything to resize your logo, which you uploaded as a HUGE png. Resize to 40px (desktop size) or 60x for phones with 2x displays. Convert to webp while you’re at it. (While you /could/ fix this with the theme, it’s going to make more sense to just resize the image.)
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