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Feedback/High latency when creating requests in Yaak on Windows leads to inaccurate API testing result

High latency when creating requests in Yaak on Windows leads to inaccurate API testing result

Đặng Lộc·5 days ago
Needs TriageBugQuestion

On Windows, Yaak has noticeable delay when creating and sending requests, which affects API performance testing accuracy.

Compared to Postman on the same endpoint, Yaak adds extra overhead before the request is actually sent, even for simple APIs returning static responses.

This delay appears to come from Yaak’s internal request handling rather than the server, making it unreliable for benchmarking backend response times.

This is server API code

use axum::{Router, routing, serve::serve};
use tokio::net::TcpListener;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let app = Router::new().route("/ok", routing::get(ok));

    let listener = TcpListener::bind("0.0.0.0:8080").await?;
    serve(listener, app).await?;

    Ok(())
}

async fn ok() -> &'static str {
    "ok"
}

And this is results comparisons between Postman and Yaak

image image
Windows2026.4.0

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