additional warnings showing with `GRAPHILE_ENV` unset or set to production
```
info:  
info:   GraphiQL: http://localhost:3000/graphiql {"GRAPHILE_ENV":"production"}
info:  
Load[20] uses a regular (non-async) function for 'execute'; if it never returns a promise and the list it returns never includes a promise then setting `Load[20].isSyncAndSafe = true` will improve performance. If this is not true, set `Load[20].isSyncAndSafe = false` to dismiss this message.
```