- A
Increase server-side caching for widgets and use a CDN for static assets
Why wrong: Caching improves repeat visits but does not help the initial load on mobile where bandwidth and processing are limited.
- B
Consolidate multiple GlideAjax calls into a single server-side script and use mobile-optimized images
Reducing the number of server round trips and using lighter images directly improves mobile performance by decreasing network latency and rendering effort.
- C
Remove all custom CSS animations and replace high-res images with scalable vector graphics
Why wrong: This reduces rendering load but does not address the multiple GlideAjax calls which are a major contributor to slowness.
- D
Implement lazy loading for images and defer all GlideAjax calls until after page load
Why wrong: While lazy loading helps, deferring all calls still results in multiple sequential calls that spike CPU on mobile.
Quick Answer
The answer is to consolidate multiple GlideAjax calls into a single server-side script and use mobile-optimized images. This is correct because mobile devices are particularly sensitive to network latency and rendering overhead; reducing the number of client-server round trips directly cuts load time, while smaller, compressed images decrease bandwidth consumption and render faster on smaller screens. On the ServiceNow Certified Application Developer CAD exam, this scenario tests your understanding of client-side versus server-side processing and how to optimize Service Portal mobile performance without a full redesign. A common trap is choosing lazy loading or caching, which only help subsequent visits, not the initial slow load caused by excessive GlideAjax calls. Another trap is focusing solely on CSS animations, which are a minor factor compared to network chatter and heavy assets. Remember the memory tip: “Fewer calls, smaller files” — the fastest request is the one you never make, and the quickest image is the one that’s already compressed.
SNOW-CAD User Interface Development Practice Question
This SNOW-CAD practice question tests your understanding of user interface development. 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 large enterprise uses ServiceNow for IT Service Management. They have a custom Service Portal for end-users to submit catalog requests. Recently, mobile users reported that the portal is extremely slow on their devices, while desktop users experience no issues. The portal theme uses many custom CSS animations and high-resolution images. Additionally, the widget client scripts are complex and make multiple GlideAjax calls on page load. The development team wants to optimize mobile performance without redesigning the entire portal. Evaluate the options and select the best course of action.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Consolidate multiple GlideAjax calls into a single server-side script and use mobile-optimized images
Option D is correct because reducing unnecessary client-side processing and network calls directly addresses mobile performance bottlenecks. Option A is incorrect because lazy loading helps initial load but does not reduce total number of calls; it may still be heavy. Option B is incorrect because caching only helps repeated visits, not the first load. Option C is incorrect because disabling animations reduces rendering, but the main issue is likely the GlideAjax calls and assets; option D combines reducing server calls and optimizing assets.
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.
- ✗
Increase server-side caching for widgets and use a CDN for static assets
Why it's wrong here
Caching improves repeat visits but does not help the initial load on mobile where bandwidth and processing are limited.
- ✓
Consolidate multiple GlideAjax calls into a single server-side script and use mobile-optimized images
Why this is correct
Reducing the number of server round trips and using lighter images directly improves mobile performance by decreasing network latency and rendering effort.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Remove all custom CSS animations and replace high-res images with scalable vector graphics
Why it's wrong here
This reduces rendering load but does not address the multiple GlideAjax calls which are a major contributor to slowness.
- ✗
Implement lazy loading for images and defer all GlideAjax calls until after page load
Why it's wrong here
While lazy loading helps, deferring all calls still results in multiple sequential calls that spike CPU on mobile.
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 practitioner preparing for the SNOW-CAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which SNOW-CAD 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.
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User Interface Development — study guide chapter
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FAQ
Questions learners often ask
What does this SNOW-CAD question test?
User Interface Development — This question tests User Interface Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Consolidate multiple GlideAjax calls into a single server-side script and use mobile-optimized images — Option D is correct because reducing unnecessary client-side processing and network calls directly addresses mobile performance bottlenecks. Option A is incorrect because lazy loading helps initial load but does not reduce total number of calls; it may still be heavy. Option B is incorrect because caching only helps repeated visits, not the first load. Option C is incorrect because disabling animations reduces rendering, but the main issue is likely the GlideAjax calls and assets; option D combines reducing server calls and optimizing assets.
What should I do if I get this SNOW-CAD question wrong?
Identify which SNOW-CAD 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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: Jun 24, 2026
This SNOW-CAD practice question is part of Courseiva's free ServiceNow 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 SNOW-CAD exam.
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