I don't think this game is very well optimized. It mostly uses a single core of my quad-core CPU and slows down a lot during mid-game. Has anyone else noticed this issue? :
Hearts of Iron III System Requirements - Can I Run It? - PCGameBenchmark
What is your best Hearts of Iron encirclement? - Quora
Hearts of Iron III System Requirements - Can I Run It? - PCGameBenchmark
Which is more important to properly run HOI4(late game)?CPU vs GPU? : r/paradoxplaza
HOI3 System Requirements — Can I Run HOI3 on My PC?
Which is more important to properly run HOI4(late game)?CPU vs GPU? : r/paradoxplaza