CacheFly

Using TTLB to Measure HTTP Performance

Your site should load as fast as possible. Even a 1 sec. delay in page response could result in a 7% reduction in conversions. Is your site fast enough? Even if you’re using a CDN to boost web performance, an underperforming CDN will still degrade your delivery. Testing is critical in determining a CDN’s actual […]

Your site should load as fast as possible. Even a 1 sec. delay in page response could result in a 7% reduction in conversions.
Is your site fast enough?
Even if you’re using a CDN to boost web performance, an underperforming CDN will still degrade your delivery. Testing is critical in determining a CDN’s actual performance and availability. Any CDN can claim to be “the fastest CDN on the planet,” but the only way to properly evaluate a CDN’s performance is to consistently test and measure it.
This guide will provide you an overview of which metrics effectively evaluate CDN performance and availability, and what tools to use to monitor your web performance—with or without a CDN (using Cedexis Radar and WebPageTest.org.)

The Best Metrics to Measure CDN Performance

-Throughput a/k/a Time To Last Byte (TTLB) – TTLB is just response time.
-Availability

What causes a slow TTFB and TTLB?

-Overloaded origin server
-Geographic distance between request and content’s origin servers
-Connectivity issues

Cedexis Radar and Real-User Monitoring (RUM)

-Many commercial services available: New Relic, Compuware Gomez, Dynatrace, Cedexis, SmartBear, Pingdom, Soasta, etc.
-Key Measurements: response time, throughput, error rate, page load time
-Generates actionable alerts

Tests: TTFB (HTTP Response Time) vs. TTLB (HTTP 100KB File Throughput Performance)

rum2
HTTP Response Time (TTFB)

Rum-3
HTTP 100KB Throughput/TTLB

Some web performance experts argue that TTFB is more important for the user, than TTLB, since web browsers may start displaying files as soon as first bytes are received—for FEO optimization.
The goal is to get the last byte to the user as quickly as possible. Everything else is noise.
How does your web performance stack up?  Contact us to schedule an appointment with our CDN experts, who can evaluate your needs and determine a custom-fit solution for you.



WHAT OUR CUSTOMERS ARE SAYING

Why do companies of all sizes choose CacheFly?

CacheFly has exceeded our expectations on every level, from the technical operation of the actual service to the top-notch support staff and their responsiveness. I don’t believe our CDN has ever suffered noticeable downtime.

Jason Marlin

Director Of Technology, Ars Technica

CacheFly just works. Our users don’t have to think about how they get our programs; they just do, fast and easily…the show must roll and CacheFly keeps them flowing without a hitch.

Leo Laporte

Founder, Owner & Host, TWiT.TV

Cachefly stood above the competition with their sensible and affordable pricing, clean interface, and straight forward API. And in 10 years, CacheFly has never failed to deliver (both literally and figuratively).

Dan Benjamin

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