Check out the solution in the video Wait Types Part IX: SOS_SCHEDULER_YIELD. Before you dive into the system, make sure you understand the architecture, as we expect to see some wait types such as these in our setup.
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As a general rule: if there's performance issues in an environment where they should not be expected (ie: we have a strong design), I investigate further. However, jumping into solving a performance issue may be a waste of time in situations where resources are heavily restricted, the design is incompatible with our resources, or other situations.