> Also, JS is cached. First time will be slow, others, not so much This is a very weak argument. * many 3rd party resources are not cacheable or may have ba

> Also, JS is cached. First time will be slow, others, not so much This is a very weak argument. * many 3rd party resources are not cacheable or may have bad policies * caches may be more often cold then you expect. most apps still cache large combined blobs, which will invalidate with each release. * pure JS size has still it's impact on performance * caching won't magically cut all network roundtrips which you need due to architectural reasons