Even though the headline could be true for every game ever made, this is actually based on a benchmark test performed by YouTuber BR34K, which showed some performance issues in the latter parts of the game on PC.
This is reported by WCCFTech, and on Reddit we see that BR34K had trouble maintaining a stable frame rate at 1080p.
Since the PC version, along with Xbox One and PS4, won't be released officially in Europe until April 12, there might be a day one patch waiting to be dropped which could well optimise the game.