There is no longer a broadly-interpreted ‘ties to the Portuguese community’ component for an adult applying for naturalisation. The only requirements are those specifically listed in the Nationality Act - 5 years legal residence, clean(ish) criminal record, language test and the absence of a threat to national security.
There used to be a general ‘ties’ component, but this was dropped from legislation in 2006. And there is a ‘ties’ test for naturalisation by act of will, which largely relates to minors.