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by re-thc 1091 days ago
~150ms is usually acceptable especially if there's no Javascript and other extra delays. >=200ms is usually. where it really shows.
1 comments
littlestymaar 1091 days ago
Keep in mind that 150ms round-trip latency means at least 600ms latency when opening a webpage because of the TCP and TLS handshake.

But even 600ms is OK on today's web (or even on today's desktop apps it seems…)

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re-thc 1091 days ago
> Keep in mind that 150ms round-trip latency means at least 600ms latency when opening a webpage because of the TCP and TLS handshake.

The solution there is use a CDN, even for the API. Or some anycast IP solution like Global Accelerator (AWS), Global load balancer (GCP) or Front Door (Azure).

You connect to the nearest region for HTTPS handshake and then that takes the "fastest" route back to your origin.

There's a video from AWS documenting how Slack did exactly that: youtube.com/watch?v=oVaTiRl9-v0

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