Well it's still a beta product so all the final optimizations haven't been made yet but it's also multi-threaded meaning it will use up any and all CPU cores you throw at it (to a point).
One of the big issues is that the massive bonuses you can get from say, UP HQ or that benevolent trait boost the influence that's already been generated in addition to boosting future generation. You go from having reasonable borders given your influence production to having massive ones in a single turn. Those big bonuses should only work on any future points generation and not what you've already built up imo.
Luxury trade routes are only good for +5% each from what I can tell.
To put some pictures on this and make it easier to see: This is mousing over the production value. It shows the research number instead. This is mousing over the research value. It shows the credit income instead. And lastly mousing over the credit income. It shows product