According to some early reports, the PC version of Dishonored 2 is plagued with performance issues. Owners of high-end GPUs are witnessing underwhelming performance, with really low framerates (that are not justified by the game’s visuals). And it appears that Arkane Studios is aware of these performance issues.
According to Harvey Smith, co-creative director at Arkane Studios, the development team is currently investigating the PC performance issues that have been reported by those who have already played the game.
Regarding the Day-1 patch for Dishonored 2 that has been reported, Harvey Smith claimed that most of the stuff that will be featured in the Day-1 patch for consoles is already present in the PC version.
According to some users, the game is plagued with performance issues – even on Low settings – due to TXAA. TXAA is a really demanding AA solution and as some gamers discovered, this AA option is enabled even on the game’s Low preset setting.
Figured it out – it's the TXAA anti-aliasing. It uses it even on Low detail, and it's a hog even on my GTX 1060.
— Dominic Tarason (@DominicTarason) November 10, 2016