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Page load times Gatsby site

We are seeing some really slow times on certain pages on our site - others are almost instant but certain pages are hanging on page-json, these files taking upwards of 30second to complete. Is there anything we can do to improve the site performance. We are using

“gatsby”: “^3.0.3”,
“gatsby-image”: “^2.0.41”,
“gatsby-plugin-image”: “^1.0.0”,
“gatsby-plugin-material-ui”: “^3.0.1”,
“gatsby-plugin-postcss”: “^4.0.0”,
“gatsby-plugin-react-helmet”: “^4.0.0”,
“gatsby-plugin-sanity-image”: “^0.6.0”,
“gatsby-source-sanity”: “^7.0.2”,

Any advice gratefully received. Thanks!

hi there, welcome. this can have many reasons - do you have a netlify site name for us? we would need to take a look to be able to give any further advice.