Improving the connection with an overloaded online store

I don't know if it is possible at all, but maybe there are some tools or other methods ... I shop at some online store. Items are added once a week at the same time. The server is then so overloaded that it takes several dozen or even hundreds of attempts to load the website and it takes up to 30 minutes. I'm looking for some way to make this connection run more smoothly. I am not the owner of this shop. I am a user.
If you are interested I will send you the address of this store to check your ideas.
Regards