Actually sometimes it's noticeable slower. Solution for this can be entry point detached from SPA (when index.html is not part of SPA, renders on the server sid

Actually sometimes it's noticeable slower. Solution for this can be entry point detached from SPA (when index.html is not part of SPA, renders on the server side and load SPA in background, while user enjoying first 2-3 seconds of reading index.html), or it can be just hidden (white page) body of document, while everything is not ready. Second variant is poor copy of usual sites loading, so detached index.html or cached data in template or even isomorphic option - they are better.