PL-900 Practice Question: Describe the business value of Microsoft Power Platform
A retail chain uses Power Apps for an inventory management app. Employees report that the app loads slowly. What is the most likely cause?
⚠ Common exam trap
Candidates often assume too many controls or screens cause slowness, but the PL-900 exam specifically tests the concept of delegation as the primary performance bottleneck when dealing with large data sources in Power Apps.
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 app uses a non-delegable query on a large data source
The most likely cause of slow loading in a Power Apps inventory management app is a non-delegable query on a large data source. When a query cannot be delegated, Power Apps retrieves all records from the data source to the client device, then filters locally, causing significant performance degradation with large datasets. This is a common issue when using functions like `Filter` with unsupported operators or columns on large tables.
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 app has too many controls per screen
Why it's wrong here
Not a typical cause of slow loading.
- ✓
The app uses a non-delegable query on a large data source
Why this is correct
Non-delegable queries retrieve all data before filtering, causing slow performance.
- ✗
The app uses too many screens
Why it's wrong here
Number of screens doesn't significantly affect load time.
- ✗
The app has complex formulas in OnStart
Why it's wrong here
While possible, the most common cause is data size.
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