Lately, lots of mobile users (using carriers such as China Mobile Hong Kong, etc.) in Hong Kong experience extremely slow loading speed (when using mobile data) when viewing media (images, videos) on X/Twitter for any resource hosted on domain pbs.twitter.com.
Based on the DNS record, this domain is on Fastly CDN via (dualstack.twimg.twitter.map.fastly.net [151.101.40.159]).
Upon testing, the download speed for any image can be as slow as 10K/s.
One of the tracert record, for your reference:
>tracert pbs.twimg.com
Tracing route to dualstack.twimg.twitter.map.fastly.net [151.101.40.159]
over a maximum of 30 hops:
1 7 ms 6 ms 6 ms 192.168.129.181
2 * * * Request timed out.
3 26 ms 34 ms 26 ms 10.17.113.66
4 40 ms 25 ms 39 ms 10.17.67.158
5 * * * Request timed out.
6 53 ms 25 ms 28 ms 10.13.129.190
7 28 ms 22 ms 23 ms 10.13.128.13
8 41 ms 33 ms 33 ms 223.119.0.133
9 26 ms 28 ms 28 ms 223.120.2.53
10 96 ms 82 ms 85 ms 223.120.3.170
11 171 ms 84 ms 189 ms 223.120.2.34
12 208 ms 204 ms 203 ms 223.120.12.85
13 212 ms 219 ms 214 ms 223.120.6.70
14 219 ms 218 ms 205 ms be5298.ccr41.sjc03.atlas.cogentco.com [38.88.224.161]
15 180 ms 182 ms 184 ms 38.104.138.194
16 253 ms * * 151.101.40.159
17 249 ms 260 ms 249 ms 151.101.40.159
Trace complete.
1 Like
Thanks @fireattack this has a ton of detail, I appreciate it. In addition, can you go to https://www.fastly-debug.com/ and send back the generated block of text? It’s just more data points that our network team can use in tuning their models.
Please see below.
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Thanks again @fireattack – I’m going to convert this thread into a support ticket so that our engineering teams can get the data into their workflows.
1 Like
I am seeing a similar issue but with my own DNSs server redirecting to Cloudflare, Google, etc. I have been testing redirecting my DNS server to my ISP DNS for twimg.com and after limited testing it seems better.
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