I understand the at if you upgrade to the business plan you can run the server persistently which means you don’t have the over head of booting the server up each call.
If you go further to dedicated plan the app has doer the access to the Postgres database which speeds things up again. Obviously hosting the app closer to your user base will save on some of the geographical overhead.
All this is paraphrased from an Anvil support email chain but I think I have the details right.