I want to know what User Misery means on my Performance / Transaction Summary views and how to interpret the score.
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User Misery measures how many unique users had a frustrating experience on a transaction.

A user counts as frustrated when their response time is greater than four times your project’s satisfactory threshold (duration, or a configured Web Vital such as LCP).

That threshold is set under the project’s Performance settings and can be overridden per transaction. See User Misery and custom thresholds.

The User Misery score shown in the UI is not a raw headcount. Sentry applies a probability distribution so low-traffic transactions don’t look artificially bad. The score rises toward 1 as a larger share of unique users are miserable, and stays lower when few users (or a small fraction of users) are affected.

To inspect the underlying miserable-user count in Trace Explorer, use count_miserable().