https://mafiagame.com/en/news/view/en-mafia-3-a-message-to-our-pc-players/
We know how important having options that best suit your PC’s performance
capabilities are. The team has been hard at work ensuring that Mafia III’s
performance is consistent across all platforms, and right now the game runs
at a solid 30 frames-per-second. We are currently working on an update for PC
that will give players the option to play Mafia III at higher framerates. We’
ll share more details about the update, and when you can expect it to arrive,
very soon. In the meantime, the team welcomes feedback and would like to hear
from you about what performance adjustment options are important to you. We’
re actively considering a number of additional post-launch improvements on PC
that would give players more control over how they can tailor the game’s
experience to suit their rig’s performance. It’s been an incredible journey
developing Mafia III and we couldn’t be more excited to get the game in your
hands and hear what you think!
简单翻译：PC板上市时将锁定在 30fps, 目前正在制作修正, 预计很快就能解除限制