Contact a company of developers who are just testing software with blockchain technology. They just check the performance of individual blocks of blockchain operations.

Well, why don't you just apply for the  blockchain testing service https://savarian.tech/services/blockchain-testing/ ? It doesn't cost a lot of money (I think that the payment for this service is quite modest)... And then you wouldn't have to "reinvent the wheel".

A network of caching servers all over the world speeds up delivery of web resources to global audience. If you have such a problem in your business, and you want to solve it with such a simple and elegant solution, then I definitely recommend you to make click and deal with it once and for all!