Quick Answer
The answer is a non-delegable query on a large data source. This is the most likely cause of slow loading because when Power Apps cannot delegate a query, it pulls every single record from the data source to the local device before applying filters, overwhelming performance with large datasets. On the Microsoft Power Platform Fundamentals PL-900 exam, this concept tests your understanding of delegation limits and how functions like Filter behave with unsupported operators or columns on big tables. A common trap is assuming all queries run server-side; in reality, only delegable queries process data efficiently at the source. Remember the memory tip: “Delegate to accelerate, non-delegate to suffocate”—if your query can’t delegate, expect sluggish loads.
This PL-900 practice question tests your understanding of describe the business value of microsoft power platform. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A retail chain uses Power Apps for an inventory management app. Employees report that the app loads slowly. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The app has too many controls per screen
Why wrong: Not a typical cause of slow loading.
The app uses a non-delegable query on a large data source
Non-delegable queries retrieve all data before filtering, causing slow performance.
The app uses too many screens
Why wrong: Number of screens doesn't significantly affect load time.
The app has complex formulas in OnStart
Why wrong: While possible, the most common cause is data size.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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.
Common exam traps
The trap here is that 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.
Detailed technical explanation
Delegation in Power Apps allows queries to be processed on the server side (e.g., SQL Server, Dataverse), returning only the filtered subset of data. When using non-delegable functions like `Filter` with `in` operator on a choice column, or `Search` on a large SharePoint list, the entire dataset is pulled to the client, causing memory and network bottlenecks. In real-world scenarios, a retail chain with millions of inventory records would experience severe slowdowns if a non-delegable query is used, whereas delegable queries using `Filter` with `=` on indexed columns would perform efficiently.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Describe the business value of Microsoft Power Platform — This question tests Describe the business value of Microsoft Power Platform — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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Variation 1. A company uses Power Apps for a field service app. They notice that the app loads slowly when users access it on mobile devices. What is the most likely cause?
mediumWhy D: Large, unoptimized images increase the payload size that must be downloaded to the mobile device, directly impacting load times, especially over cellular networks. Power Apps loads all resources, including images, when the app starts, so oversized images cause significant delays. Optimizing images (e.g., compressing, resizing, using modern formats like WebP) reduces bandwidth usage and speeds up app loading.
Last reviewed: Jun 11, 2026
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