How do I increase my fps on an macbook?

Im stuck using a 2011 macbook pro (yikes), and I currently run the game around 27 fps for duo lanes and 13-22fps for skirmishes/teamfights.

I run the game in a window, lowest resolution and basically set everything to lowest possible setting, and make sure every other application is closed before I open up league. Ive used some online configs to lower my in game settings even more, but it usually doesn't change the fps much. I've tried going to the riot fps trouble shooting page, but it keeps detecting my OS as Mac os X even though I've updated to Mac High sierra just so I can even launch the game.

Heres my mac specs:

Model Name: MacBook Pro Model Identifier: MacBookPro8,1 Processor Name: Intel Core i5 Processor Speed: 2.3 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 3 MB Memory: 4 GB Boot ROM Version: MBP81.0050.B00 Chipset Model: Intel HD Graphics 3000

Is there any way to make so i can atleast run the game at a stable 30 fps ?