Today, I have a good method for low end PCs like me, specially for "Intel" users. The method is just changing the resolution.
Intel users:Right click on your desktop and click on
"Intel Graphics Settings"

Click on
Display
Click on
"Maintain Display Scaling". 
This should fix the black bars on the side
Now head ingame, and change the resolution to
800x600You will notice a huge FPS boost (Probably 10+ FPS).
Here are 2 pictures, both with
same settings. One with 800x600 resolution, another with 1280x720 resolution.
1280x720 Resolution: 25 FPS
800x600 Resolution:
Chat will be too big, so I suggest you change it to 18 or 17.
My specs:
Intel core i5-6300U
8GB RAM
Intel HD 520
I hope this method satisfy most Intel users.
