To keep things simple. I will explain just a few key points players should know about Performance-Based Skill Rating adjustments and how it applies in Overwatch:
- Performance-Based Skill Rating is only calculated for players in the Platinum and lower tiers.
- Performance-Based Skill Rating is only a MINOR influence in your overall skill rating calculation. The other factors of your strength of schedule (comparing your current SR in comparison to the opposing team average SR), the frequency of play (the more you play the more consistent your adjustments are), and most importantly whether you won the match or not, help determine your overall skill rating adjustment.
- Performance-Based Skill Rating will take any amount of play time you have had on each hero and derive stats to average out in comparison to similar players of the same skill rating who played the same heroes you did in their own matches.
The user Kaawumba has a far more detailed guide to this and other factors to how your skill rating is calculated in Competitive: