Since patch 8.4 I have been experiencing increasing frame drops and random lag outs. Reading the boards, it seems to be a common problem.
After patch 8.7, LoL literally became unplayable for me (15fps in team fights) - So I decided to try anything and everything to try and alleviate my problem and I found that this worked for me:
Note: Am using a Mecer M330 i3 2.13GHz, 2GB ram, Windows 10 (quite a low-spec laptop) and I get a solid 60-80 fps.
* Change all video setting to very low and cap frames at 80
* Disable Character Inking, Anti-Aliasing and Wait for Vertical Sync
* Turn "Enable HUD Animations" off
* Remove 'non-essential' Combat Text
* Add the following changes to the game.cfg file:
**Firstly, you will need to locate your "League Of Legends" folder that is inside a "Riot Games" folder. Then click the first folder which should say "Config" and you should be able to locate the game.cfg file. Find the file and right-click it. Next, choose "Edit." Afterwards, scroll down until you see the section "Performance." Replace the text you see there with the text right below**
**15fps to 60fps**
**From having severe frame issues (and some intense tilt due to it) to being able to play LoL without pulling tufts of my hair out!**
**Try it and let me know if this worked for you!**