devtrackers.gg
TL;DR:
Personal performance doesn't impact how much mmr you gain or lose after a match, it's simply win = gain mmr / lose = lose mmr.
Win streaks don't trigger a sudden increase in MMR.
I've linked the entire lengthy exchange at the bottom, here's the gist of it:
There is an article by Riot on MMR that states "...At that point, you'll need to win a ton of games in a row to signal to the system that you belong in a higher rank." Recently I hit 11 wins in a row and I was curious why I was still gaining the same LP.
Riot: "Ah, there isn't an exact number to basically translate to that "ton of games" thing. Basically they are trying to say that you would need to win a lot of games to get your MMR back on track but that does very well depends on where your MMR was at..."
I then asked for clarification: "is there currently no mechanic in place that gets triggered after a lengthy-enough win streak in which you suddenly gain more MMR or LP per game?"
Riot: "That would be correct. It's pretty much keep on winning more games than losing and your MMR will catch up to your rank..."
Regarding personal performance:
Riot: "personal performance itself doesn't affect MMR in League. I do believe this is because the team did want so League focuses even more on the aspect of team and teamwork, so it is more that you win and lose together as a team.
Here's the conversation: https://imgur.com/a/COaxOWN
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