1. DNS Response Time
Some CDN have complex DNS setups that will cause the performance become slow. This may appear to be a short wait time, but it is balanced by a longer DNS response time. Tests done in the backbone can have a big impact on last-mile and end-user DNS performance. This is because end users rely on their Internet Service Providers or Public Resolvers’ DNS resolvers, whereas backbone monitoring depends on resolvers located close to the machine performing the tests.
2. Wait Time
Wait Time is a symptom of any potential capacity concerns or improper setups on your origin server or within the network of the supplier. Wait Time can also tell you if your content is being provided from the edge or if it’s being fetched from your origin server.
CDN provide different levels of performance. This is due to the fact that it is a shared environment in which popular items must be supplied as quickly as possible.
3. Connect Time
Examine the various connect times to ensure that your CDN has excellent network connectivity, minimal bandwidth, and no packet loss. You should also ensure that it does not slow down during busy hours and that you are being routed to the appropriate network peering.
4. Cache Hit
Most CDN will provide you with a control panel, so keep track on your Cache Hit. Keep track of the number that has to return to the origin. A effective CDN architecture should not require frequent visits to the origin.
5. Trace routes
Many CDN employ commercial geo-mapping databases to map their customers to the correct regions, yet due to incorrect IP addresses, clients are often assigned incorrectly. To ensure that you are not mapped to the wrong location, run trace routes from where you are monitoring.
Conclusion
In the nutshell, when it comes to offloading your static asset management and improving content delivery to your end customers. But your work is still not finished after you’ve chosen and are up and running on their platform.
You should engage with your CDN provider on a frequent basis and keep track of their performance indicators against the origin at all times. As a result, you and your supplier will have a symbiotic connection that will benefit both parties in the long run.
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