u/RiotBrentmeister, since i see you are only one willing to talk about fps issues from Riot side, i need to ask for your advice.
I literally tried everything to fix fps drops from turning on 'disable fulscreen optimization', OCing CPU, Turning off SMT, cleaning %temp% files, OCing GPU, Scanning viruses, updating all drivers, and many other things.
Met few people with similar cpu like mine R5 2600, they have no issues at all.
In my case most fps drops i get on 'Bind' map where it can drop from 230 to 85 if i shoot and have some spells around me, while on other 2 maps i have fps drop maybe down to 115, 120 which is acceptable since its beta. (Noticed some weird drops while looking at certain parts of the map quite weird)
I think i had no issues like now, it all started since second last update like week ago? Not sure.