Here you are on steemit one of the most advanced blockchains. The words you wrote are on the blockchain.
Do you mean that you can't imagine the referents of your words being on a blockchain because networks are slow?
There are different sub networks though for other types of content.
If the content was ocean freight for instance then I'm sure that the blockchain would not slow it down.
I know that is a far stretch but I am serious. If you think the answer should be more specific then maybe you should be more specific about what your doubts are.