CDN testing?

Question

System administration

The company that provides the CDN is a black box for us.
We have 3 different services that use the services of this company, they are separated physically and legally, but (in theory) the same content delivery configurations (but it is not clear what CDN settings are).
As a result, 1 out of 3 services renders content extremely poorly, sales are falling, refounds are growing, etc.
By and large, we cannot test and identify bottlenecks ourselves (except how to rent a couple of servers in problem areas and send data to a CDN company, but how many problem areas we do not know).
Question. What are the solutions for CDN testing? What are the bottlenecks to pay attention to? And in general, how to convince the host (yes, you need to convince him) that the existence of a problem is an exact fact?

Answer 1

What CDNs have you tested?
If your main audience is Russia and the CIS, then I advise the Russian CDN, namely cdnvideo.ru points of presence throughout Russia and the CIS, Europe, America.
I tested CloudFront and Cloudflare, content from America was given, the ping is naturally high, so using their service is not an option in Russia, it makes no sense because, as far as I know, they do not have points in Russia.
Having rented a server on m9, I cover all the cities of large cities of Russia without any problems, if you have a project with heavy static, a lot of pictures, videos or video streams, then the CDN will be very relevant to you, since under normal load the channels will clog and some of the clients will fall off or they will start glitching (you have to buy a large bandwidth, and this is expensive) and if you are DDoSed, since CDNs can withstand very heavy loads ))

Answer 2

The mice cried, pricked, but continue to eat the cactus.
Maybe it's easier to choose another provider than to suffer with one?
Try here G-Core Labs, for example. It's super in Russia and the CIS, excellent in Europe and normal in America.
On the trial they give 2 weeks and 300 gigs of traffic, enough to evaluate the service.
And they also have anti-ddos.