So, me and a lot of others here on League of Legends Boards,had a problem with low FPS in-game.. I went from 70-90 FPS to 20-40 FPS.. It was horrible..
After a lot of search on Boards (of course with no luck) I found a possible solution for this problem.. (I say possible because my FPS went back to normal!)
So follow the steps 1 by 1..
Step 1. Go to League of Legends Icon, Right-Click on it and then click Properties.. This will come up.. http://prntscr.com/f4u6mm (this is a screenshot dont be scared lol)
Step 2. Click "Compatibility" http://prntscr.com/f4u7ex
Step 3. Please see this picture for this step cause I dont know how to explain it lol..sorry http://prntscr.com/f4u8gf
Step 4. Then Click Apply http://prntscr.com/f4u8zk
Step 5. Open League and try a custom with all the Bots so you see how it runs..
P.S This was tested on my Windows 10 Laptop.. I dont know if this will work for you if you have another version of Windows.. I am not responsible for any damage happen to your League of Legends Client and I wont accept negative (Flame) comments as I tried to help ya all..
Hope I helped and have a nice day! <3