You are correct with Portugal, I found this on some website:

Portugal is, overall, the easiest country to get citizenship of the EU.

That’s due to the following factors:

Short residency period of just five years before applying for citizenship
One of the world’s most powerful passports
Range of flexible visa options to suit remote workers, retirees and investors
Dual citizenship OK – keep your original passport
Easy language requirements – A2 elementary level
Access generous tax benefits while counting up the years to citizenship
Reasonable minimum stay requirements
What’s more, Portugal has one of Western Europe’s lowest costs of living