Crazyload Page Speed Optimizer vs Thunder Page Speed Optimizer
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 6, 2026.
The short answer
- On the Shopify App Store: Crazyload Page Speed Optimizer 4.9 from 42 reviews and Thunder Page Speed Optimizer 4.9 from 89 reviews.
- Both list a free plan. Paid plans start at $25/month for Crazyload Page Speed Optimizer and $19.99/month for Thunder Page Speed Optimizer.
- Thunder Page Speed Optimizer lists 3 features Crazyload Page Speed Optimizer’s listing doesn’t mention, including Audits, Scripts, Theme optimization.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Basic
- · Improves PageSpeed & GTmetrix scores
- · Lazy Load, Caching, and Preloading
- · Minimize Blocking Time by 3rd Party Apps
- · Up to 2.5k pageviews / mo
Starter
- · EVERYTHING in Basic Plan
- · Improved Performance on Slow Connections
- · Minimize JS & CSS files
- · Reduced Load on Mobile
- · Up to 50k pageviews / mo
Premium
- · EVERYTHING in Starter Plan
- · Increase Audience Reach and SEO Rankings
- · Premium speed boost & customer service
- · Up to 100k pageviews / mo
Business
- · Boost sales & improve conversion rates
- · EVERYTHING in Premium Plan
- · Offers our maximum site speed boost
- · Up to 200k pageviews / mo
Free Plan
- · Basic Optimizations
- · Email Support
Advanced
- · Auto-optimize on theme updates
- · Critical CSS
- · Daily Lighthouse score tracking
- · Defer JS, CSS & 3rd-party apps scripts
- · Lazy-load offscreen images
- · Predictive Link Preloading
Visitor Insights
- · 500K visitor pageviews included
- · Actionable fix suggestions
- · All optimizations included
- · Core Web Vitals from your real visitors
- · Core Web Vitals: LCP, CLS, INP
- · Page-by-page Core Web Vitals breakdown
AI Agent
- · Automatically fix theme issues
- · Automatically optimize Core Web Vitals
- · Detect regressions within hours
- · Includes Performance Insights
- · Powered by Claude Opus & GPT-5.6
- · Priority Hands-On Support
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureImprove your page load speed with CrazyLoad because every millisecond counts. Don't let slow page loads cost you potential sales or hurt your SEO rankings. CrazyLoad ensures your Shopify store runs at peak performance, whether on mobile or desktop. Harness our cutting-edge features like Dynamic Preload, efficient image optimization, theme turbo-charging, and streamlined script processing.
Keep your store speed fast, easy to discover, and ready for AI / LLMs. Thunder continuously monitors how real shoppers experience every page and proactively optimizes slow pages, images, CSS, navigation, and third-party scripts. It identifies delayed clicks, layout shifts, broken links, and hard-to-crawl content, then prioritizes what needs attention.
- Boost PageSpeed & GTmetrix scores with professional speed optimization.
- AI-powered speed up personalized for your site with LazyLoad, CSS & JS deferral
- We continuously scan your site for new images & automatically compress them
- Javascript & CSS minification to make your website as small & quick as possible
- Massively speed your store up. Boost SEO score. Lower CPMs.
- Fix apps and themes that slow down your store speed score.
- Faster websites = Less frustrated customers = More Sales
- Instant "Above The Fold" loading + Predictive preloading webpage technology
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Crazyload Page Speed Optimizer |  Thunder Page Speed Optimizer |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | Crazyload Page Speed Optimizer | Thunder Page Speed Optimizer |
|---|---|---|
| App Store rating | 4.9 ★ | 4.9 ★ |
| App Store reviews | 42 | 89(ahead) |
| New reviews, 28 days | Not enough data | 7 |
| Reviewers a year or more in | 0% | 0% |
Pricing
| Measure | Crazyload Page Speed Optimizer | Thunder Page Speed Optimizer |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $25/month | $19.99/month(ahead) |
| Longest free trial | 5 days | 7 days |
| Plans listed | 4 | 4 |
Listing
| Measure | Crazyload Page Speed Optimizer | Thunder Page Speed Optimizer |
|---|---|---|
| Shopify category rank | #27(ahead) | #54 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Nov 28, 2023 | May 27, 2022 |
| Languages | 1 | 1 |
| Developer | AccessibilityWay | Enigma Apps |
FAQ
Crazyload Page Speed Optimizer and Thunder Page Speed Optimizer: common questions
- Is Crazyload Page Speed Optimizer or Thunder Page Speed Optimizer cheaper?
- Both list a free plan. Paid plans start at $25/month for Crazyload Page Speed Optimizer and $19.99/month for Thunder Page Speed Optimizer. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, Crazyload Page Speed Optimizer or Thunder Page Speed Optimizer?
- On the Shopify App Store: Crazyload Page Speed Optimizer 4.9 from 42 reviews and Thunder Page Speed Optimizer 4.9 from 89 reviews.
- What features does each app list that the other doesn’t?
- Crazyload Page Speed Optimizer lists 2 the others don’t mention, such as Content optimization, Reporting. Thunder Page Speed Optimizer lists 3 the others don’t mention, such as Audits, Scripts, Theme optimization. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 6, 2026; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 6, 2026. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.