Carousell is a rapidly growing online marketplace based in Singapore, operating in multiple countries and handling extensive traffic with over 158 million listings. The document highlights Cloudflare's solutions that enhance Carousell's performance and security, including CDN, firewall, and caching capabilities to manage user demand and traffic spikes. Additionally, several innovations aimed at improving image delivery and reducing latency for web applications and live video streaming are introduced.

2. Derek Yee
Director of Product
Marketing,
Cloudflare
Anand Guruprasad
Solutions Engineer,
Cloudflare
Harshad Rotithor
Chief Architect,
Carousell

4. Carousell
Carousell is a smartphone and web-based marketplace for buying and selling new and used
goods. It is headquartered in Singapore and operates within Singapore, Malaysia, Indonesia,
Taiwan, Hong Kong, and Australia. Carousell is one of the world’s largest and fastest growing
classifieds marketplace.
Scaling rapidly to handle a growing user base, managing spikes in traffic on sale days and
meeting intensive performance requirements, and ensuring uptime by guarding against
DDoS, XSS and injection attacks.
● Supports 158M+ listings
● Ability to support 4x traffic spikes during promotions
● 10K requests to their search API
● Security without compromising on performance
“Cloudflare handles our
requirements of a CDN,
Firewall, Caching layer, SSL
endpoint, and DNS, while
giving an excellent return on
our investment. We are
highly impressed with the
quality and the speed of the
technical support provided
as well.”
HARSHAD ROTITHOR
Chief Architect

5. Speed Week: Image Resizing
What: Cache resized images from a single master.
Why: Customers need to ensure the right sized
image is being delivered to a user based on their
type of device. Having to store and catalog
multiple versions of a single image impacts
storage, and becomes difficult to manage over
time.
Who: Ecommerce, media and publishers with
websites that have large image catalogs
5
* Based on the 20% of Internet pages with improperly sized images according to HTTP Archive

6. Speed Week: HTTP/2 Prioritization
What: Prioritize HTTP/2 requests from the
origin/server instead of relying on client side
browsers.
Why: Every browser handles prioritization
differently, which leads to inconsistent page
performance. Cloudflare will provide built in
support for prioritization, and will allow customers
to build advanced configuration rulesets to further
control page load times.
Who: iOS users on Safari will see the biggest
benefits. eCommerce and WordPress sites will also
benefit from this.
6

7. Results with Carousell

8. Speed Week: Parallel Streaming
What: Faster image loads
Why: Parallel streaming of progressive images
leverages the HTTP/2 prioritization schema we
released to improve the load times for images on a
page.
Who: Image heavy sites using progressive JPEG
images.
8

12. Speed Index
The speed index takes the visual
progress of the visible page
loading and computes an overall
score for how quickly the
content painted.

14. Speed Week: Inside Cloudflare Argo
14
What: Enable transit selection and leverage
machine learning to make Argo even faster.
Why: With Transit Selection, Argo Smart Routing
chooses not only which data centers to route
traffic through, but also which specific network
links to use at each hop based on real-time
performance measurements. This further reduces
request latency to help make Argo faster than
ever.
Who: Websites that rely on a high concentration of
dynamic content and scripting that inhibit overall
site performance.

15. Speed Week: Concurrent Streaming
Acceleration
What: Stream live video to multiple viewers with
reduced latency
Why: Live video is becoming increasingly prevalent
with customers. Ensuring that all viewers have a
consistent, timely viewing experience is important.
Who: OTT providers and video publishers that
serve live video streaming content
When: May 16th, 2019
15
2 second Potential latency reduction for live video

16. Speed Week: Binary AST
What: Support for Binary AST, a lightweight
JavaScript format that reduces the time it takes for
browsers to parse JavaScript.
Why: Large JavaScript files can take a long time to
parse, resulting in slow page startups and a poor user
experience. In collaboration with Mozilla, we are
helping them test their proposed standard for Binary
AST.
Who: Web developers that are building complex
JavaScript heavy web pages and applications.
When: May 17th, 2019
1630 - 50% Improvement in JavaScript parsing performance on the most common

18. Resources
• The New Speed Page
• Faster Script Loading with Binary AST
• Live video just got more live
• Simplifying optimal image delivery
• Parallel streaming of progressive images
• Better HTTP/2 Prioritization
• Argo and Global Private Backbone

19. Q&A