Hi There,
It completely depends on the business requirement how many server calls need to be sent per page. ~6-7 server calls seem to be a bit on the higher side. Generally, we see 3-4 calls max. However, if each server call is sending different data then it might be useful for the analysis as per the client's use case. If the data sent in the server calls is the same then you may check the implementation and rectify it.
Hope this helps!