The new cache interface is nice, once it has loaded, but the loading takes a while. To me it is 7.5 seconds until the interface is ready:

That appears to be primarily determined by the 2.8 s specs_data.json download and the subsequent processing of that json. In other projects I've been able to benefit from json.gz to speed up the transfer itself (at much smaller deflate cost). But I think the main benefit could here be in downloading the json files in a different order, starting with what's needed for the main interface only, and then downloading the large artifact last with a promise.
The new cache interface is nice, once it has loaded, but the loading takes a while. To me it is 7.5 seconds until the interface is ready:

That appears to be primarily determined by the 2.8 s specs_data.json download and the subsequent processing of that json. In other projects I've been able to benefit from json.gz to speed up the transfer itself (at much smaller deflate cost). But I think the main benefit could here be in downloading the json files in a different order, starting with what's needed for the main interface only, and then downloading the large artifact last with a promise.