PL-900 Demonstrate the capabilities of Power Apps Practice Question
A Power App uses a Timer control to refresh data every 5 minutes. The app experiences performance degradation after running for several hours. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The data source is not delegating queries, causing the app to load all data each time
If the data source does not support delegation, Power Apps loads all rows into memory each time the Timer control triggers a refresh. Over several hours, the accumulation of data in memory causes performance degradation. Option A is incorrect: while a Timer control could contribute to memory usage if not properly disposed, it does not inherently have a memory leak. Option B is incorrect: a 5-minute interval is not excessively short for typical data refresh scenarios. Option C is incorrect: CDNs are used for static content delivery, not for resolving memory buildup from non-delegated queries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Timer control has an internal memory leak
Why it's wrong here
Timer controls do not have memory leaks
- ✗
The timer interval is too short, causing excessive network calls
Why it's wrong here
5 minutes is a reasonable interval
- ✗
The app is not using a CDN for static resources
Why it's wrong here
CDN is unrelated to refresh performance
- ✓
The data source is not delegating queries, causing the app to load all data each time
Why this is correct
Non-delegable queries load entire dataset, consuming memory
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PL-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-900 exam.