1 second latency issues. (TCP retransmission?)

[TomerHeber]

I send fetch requests from SvelteKit to a backend.
Most requests (99.999) average around 20ms, but only a very small percentage exceed 1 second.
I suspect it's a TCP retransmission issue (it's very rare, but I really hate seeing the latency).

Are there any recommendations (configurations) I can use to avoid that?

Thank you!

[mcollina]

Very hard to tell without assembling a lab and inspect.

My recommendation is to check the keepalive timeout on both sides