[rudra]

after reading this thread i felt like committing suicide. and that's a first for me. i have been through a lot in life and even more so lately. but never felt like killing myself. ever. killing others....yes yes yes. myself . never...so with that out of the way...

Caching can be dns caching and it happens at multiple levels.your own system do not query every domain to ip translation everytime when required. they save the reply once they have done it (TTL - Time to live ...in cache). it is a cache too. and routers and machines between dns root server and your own system have their own dns to ip list too. so that they dont always bother the higher level. can unnecessary to even detrimental.

other caching is website asset caching...like scripts, images, files...all static content can be cached and cloudflare do have that service. but that is NOT RELATED TO DNS. your own pc caches files too. once it has received some static asset with an explicit or implicit caching time value / settings. so cloudflare works as a cdn and those servers sitting between content server and you, they do caching too. for fast load, less unnecessary traffic , efficiency etc.

but this improves page load time. when you download a single file ( or upload it ), all these have no effect. and once dns system of your pc has got the ip of the destination, DNS is not going to have any further effect in the speed of upload or download.

i really don't understand how hard it can be .....

you can even setup a local reverse proxy and all the pages found in it will load faster. but not much impact on upload and download
files .