My company is focused on "top performers" - people who finish most tasks on the shortest time. It's a competitive environment and that's not unusual for software companies. We are told frequently who finished with "best" results.
The problem is I'm assigned on multiple projects. On both of them there are people who work only on the single project. Some of them push themselves hard - late nights, weekends, you get the picture. My contributions on the other hand are very small - constant context switching during the day, meetings that overlap, etc. The result of this is I'm on the bottom of finished tasks on all the projects.
While my contributions are valued on all the projects and that's important for the company, I feel like thrown under the bus. Some of my performance reviews were not particularly glowing because of not being "top performer". It's not easy to explain that experience did not substitute hard work. Also it's not my job to explain that people work extra hours.
How should I prepare for my next performance review, since tasks output is the most important metric?