Also, if you are really struggling for FPS, there are a few other things I noticed that will add 3-4fps each on my system, not that much but if you are running at 15fps normally, getting it up to 21-22 would be a big deal...
Make sure your system page file size is 1.5 times the size of your total RAM (can be lower, like 1x, but no higher). There are a ton of tutorials for this on the internet specific to your OS. Just google it. Make sure this is adjusted for your OS Drive and the Drive you installed the game on (works best on all drives, just for overall system stability). I.E if you have 32GB of RAM, a page file from 16384MB to 49152MB is suggested, but 16384-32768MB is likely far-far-more than enough. However if you have only 8GB or 12GB, 4096MB-12288MB or 6144MB-18432MB would be totally suggested and likely help a whole lot. If you have 16GB+ RAM the boost will be minimal, where the lower you go on RAM the greater the boost you will experience from this.
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Also, setting the exe to high priority in your Task Manager. On windows, launch your task manager, you can do this by right clicking the task bar and selecting task manager, or Ctrl+Alt+Del and select it there. Then minimize and run the game. Once the game loads, Alt+Tab to the task manager and highlight the exe. Then jump over to the details tab, right click, and select set priority "high," never choose "real time," you will likely crash. This allows the game to self-allocate additional RAM and such, but may cause system instability, and needs to be set every time you load the game unless you make a custom launcher shortcut to add high priority, which I suggest, as alt-tabbing is typically not liked by the game itself. You can also set the core affinity here to everything but the lowest [0 or 1 usually] which the OS runs on by default. Stopping your antivirus is suggested, especially if you run mods, but not if you need to go online while playing, but for so long as you are offline, it is unnecessary and hogs resources.
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Most modern systems won't suffer from a high setting but if you get undesirable results, dial it back to "above normal." If the system is old or cheaply built, then you can always instead lower other memory hogging processes instead. These will all reset when the system resets, so you won't permanently break anything this way.
Finally, programs like the IOBit Game Booster 3.4 Beta or Razer Game Booster (I use the former not the latter --
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) can really help with processes if you do not have something similar. NOTE: if you are already getting 50+ fps this will likely do little and you are not going to get much more from this game until real optimizations occur, but if you are stuck at 20fps this will likely help quite a bit.
Hope this helps someone...