Loading the same website on a custom domain is dramatically slower (due to image assets) compared to loading the same site on the netlify.app domain.
https://jimdixon.netlify.app/tiling (2.6MB loads in 1.72s)
https://jimdixon.co.uk/tiling (2.6MB loads in 24.97s)
An example of a slow image
– x-nf-request-id: 8e7570c1-2b2c-4be5-80cf-6d2fde66239e-2186002
b. on custom domain
– x-nf-request-id: e1debdd2-2dd4-4222-91fe-fe8b3f9edd24-792349
I believe this relates to two closed threads: