furiosa

Anthony comes out as Transgender.
 
So let's all welcome Emily, I hope she doesn't get too camera shy, we'd still love to see you.
 
(AND WE STILL WANT EMILY LINUX CHANNEL)
 

I'm able to play this generation of games @ 1080p/60 fps with an (almost) 3 year old mid grade RX570 and a 4c/8t CPU....there's no telling what system recommendations will be for gaming in the future. 
 
IMO, your graphics card is probably okay for a bit.

That's gonna raise CPU usage, not lower it.
The max CPU temp on an i5-4690 is 72.72 degrees. Once it goes above that, it is no longer in the "safe" zone and could start thermal throttling. When you keep it in the 50's to 60's, there's never anything to worry about temperature wise at all.
This is great news and completely common. You're in the right direction to a minor bottleneck. Fps also is common to dip in certain areas of certain games. Go outside the city into the countryside in GTA 5 and then go back into the city to see what I mean. Fps varies dramatically in these areas. Just how GTA 5 is. Same with The Witcher 3. And when you use fire spells and special effects are going on, your CPU is gonna hit 100%. That is common.
It will definitely lower your CPU temp and that is a good thing. You don't exactly need a beefy air cooling system, just something better than stock. However, stock is still sufficient when you get that 100% usage to not be so often. It won't hit such high temps when that usage is less often if you know what I mean.
Well, there's multiple things and you've either already done them or you haven't. Each one of them doesn't exactly boost performance in a big way, but the more things you do to your PC, that's when you'll start to notice better performance.
 
There are a number of guides and videos on the internet for optimizing your PC for gaming and in each guide/video, you will without a doubt find some of the exact same things to do to your PC. The trick is to watch and read as many as you can, completely optimizing your PC for gaming. Here are some example videos that worked for me...
 
I've been subbed to this guy for a while, he's someone you'll want to really listen to...
 
Found this one yesterday, it has some things worth doing in it...
 
This is one I've had bookmarked for quite some time. Tons of things in this one...
 
Another one packed with things to do...
 
Just another random one I found and bookmarked like a half a year ago. Some useful things here too.
 
Make sure you listen to what these people are explaining. You don't have to do every single thing they say. So if you're not sure about something and what they explain still doesn't get you to understand, just skip it. And when messing with anything to do with registry, make sure you listen very closely and decide if you want to mess with it. I personally don't touch my registry and messing with it is something of a last resort.
 
These things will not be a miracle fix. But what they will do is make a difference, hopefully a noticeable one. And they'll also make Windows snappier and give you better boot times. Always remember to restart your PC after doing all these.

Damn, my v sync is already on fast, but my maxframe was set to 1, i'll try with 4! 

Guys thanks you all so much! I finally made my game playable!
 
MY SOLUTION
After an exhaustive things I've done to make my game playable, I finally achieved a stable 60 fps in 95% of the time I'm playing (with rare drops at 50 fps in intensive moments), here are the things I've done:

1. Updated Windows to Falls Creator's version
2. Formated my PC
3. Updated my BIOS (mine is h97m)
4. Unparked my CPU cores
5. Used the following user.cfg's commands:
gametime.maxvariablefps 61 (adjust to your monitor rate)
RenderDevice.RenderAheadLimit 2
gstrender.thread.maxprocessorcount 4
6. On NVIDIA Control Panel, I set on bf1.exe: V-Sync to FAST (I was having terrible tearing), Thread Optimization OFF, Max renderedframes to 1
7. Sometimes I change the process priorty of bf1.exe as High on Task Manager (I really don't know if it's a big deal)
8. Last but not least, I just increased my Resolution Scale, set Post-Processing and Effects to MEDIUM

So that's it guys, I hope this things I mentioned above help you if you're having the same problems I had!