- A
The service should use Gen2 execution environment for better background processing.
Why wrong: Gen2 offers higher memory and performance, but the issue is concurrency, not execution environment.
- B
The CPU always-on setting is not sufficient; you need to enable background CPU.
Why wrong: CPU always-on is the correct setting for background tasks; there is no separate 'background CPU' setting.
- C
You need to increase the request timeout beyond 60 minutes.
Why wrong: Timeout is not mentioned; the issue is tasks not completing, likely due to CPU starvation, not timeout.
- D
The concurrency setting of 80 allows too many requests to share the instance's CPU, starving background tasks.
High concurrency causes resource contention; reducing concurrency gives each request more CPU.
PCDE Optimising Service Performance Practice Question
This PCDE practice question tests your understanding of optimising service performance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
You are running a Cloud Run service that performs background image processing tasks after responding to HTTP requests. Users report that tasks are sometimes not completed. You have set CPU to always-on, but you notice the service's concurrency is set to the default of 80. What is the most likely cause of incomplete tasks?
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.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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 concurrency setting of 80 allows too many requests to share the instance's CPU, starving background tasks.
Cloud Run allows up to 80 concurrent requests per instance by default. If the concurrency is too high, the instance's CPU may be overwhelmed, causing background tasks to be preempted or not completed. Setting CPU to always-on ensures CPU is available but does not limit concurrency. Reducing concurrency to a lower value (e.g., 1) ensures each request gets dedicated CPU for background work.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 service should use Gen2 execution environment for better background processing.
Why it's wrong here
Gen2 offers higher memory and performance, but the issue is concurrency, not execution environment.
- ✗
The CPU always-on setting is not sufficient; you need to enable background CPU.
Why it's wrong here
CPU always-on is the correct setting for background tasks; there is no separate 'background CPU' setting.
- ✗
You need to increase the request timeout beyond 60 minutes.
Why it's wrong here
Timeout is not mentioned; the issue is tasks not completing, likely due to CPU starvation, not timeout.
- ✓
The concurrency setting of 80 allows too many requests to share the instance's CPU, starving background tasks.
Why this is correct
High concurrency causes resource contention; reducing concurrency gives each request more CPU.
Clue confirmation
The clue words "most likely", "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which PCDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Optimising Service Performance — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCDE question test?
Optimising Service Performance — This question tests Optimising Service Performance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The concurrency setting of 80 allows too many requests to share the instance's CPU, starving background tasks. — Cloud Run allows up to 80 concurrent requests per instance by default. If the concurrency is too high, the instance's CPU may be overwhelmed, causing background tasks to be preempted or not completed. Setting CPU to always-on ensures CPU is available but does not limit concurrency. Reducing concurrency to a lower value (e.g., 1) ensures each request gets dedicated CPU for background work.
What should I do if I get this PCDE question wrong?
Identify which PCDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "always". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PCDE practice question is part of Courseiva's free Google Cloud 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 PCDE exam.
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