Cache location and performance

I am running CesiumJS on multiple browsers on OS X 10.15.7 (Safari, Chrome, Firefox). We are using an on-premise Ion server.

I noticed my scene renders orders of magnitude faster the second time, as if it’s loading from a pre-rendered cache. Interestingly, the cache appears to be shared between the 3 browsers.

  1. Is there a cache?
  2. What does the cache actually cache?
  3. Is the cache on the server or the client?
  4. Where is the cache located?
  5. How do I clear the cache so I can test first load performance?