Users say "the app is slow". You have no other information. Walk me through how you turn that into a specific, fixable cause.
Answer it out loud before you open anything. The value of the flags below is in comparing them to what you actually said.
The situation behind the question
A B2B application. The complaint arrives through account management as a churn risk. The team has already spent a sprint reducing bundle size and nobody reported an improvement.
What it is really testing
Whether the candidate has a diagnostic method or a list of optimisations. The failed bundle sprint is the discriminator: it is evidence that the team optimised the thing they knew how to measure rather than the thing users felt.