# TLS Handshake Delays and Performance Issues on Specific Client Devices (NGINX Troubleshooting)

**URL:** <https://community.nginx.org/t/tls-handshake-delays-and-performance-issues-on-specific-client-devices-nginx-troubleshooting/8706>\
**Category:** NGINX\
**Tags:** reverse-proxy, web-server\
**Created:** [December 29, 2025, 10:29am UTC](https://community.nginx.org/t/tls-handshake-delays-and-performance-issues-on-specific-client-devices-nginx-troubleshooting/8706 "2025-12-29T10:29:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Saira](https://drob5swvtjqxg.cloudfront.net/user_avatar/community.nginx.org/saira/32/637_2.png) [@Saira](https://community.nginx.org/u/Saira)\
**Post date:** [December 29, 2025, 10:29am UTC](https://community.nginx.org/t/tls-handshake-delays-and-performance-issues-on-specific-client-devices-nginx-troubleshooting/8706/1 "2025-12-29T10:29:09Z")

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Hi everyone,

I’m looking for insights into diagnosing **TLS handshake delays and inconsistent performance across different client devices** when using NGINX as a reverse proxy. In some setups, websites perform perfectly on Windows and Android clients, while certain devices (especially with stricter TLS implementations) experience slow page loads or intermittent timeouts.

I’m particularly interested in best practices around:

- TLS protocol and cipher selection

- MTU and PMTUD-related issues

- HTTP/2 vs HTTP/1.1 behavior

- Network path differences (ISP, router, firewall)

Real-world troubleshooting experiences or configuration tips would be greatly appreciated, especially cases where the issue wasn’t immediately visible in NGINX logs.

On a lighter note, dealing with infrastructure cleanup often reminds me that operational hygiene matters everywhere — whether it’s servers or real life tasks like arranging reliable **final cleaning services** after a move.

Thanks in advance for your help!

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**Author:** ![discourse\_ai\_spam](https://avatars.discourse-cdn.com/v4/letter/d/c68b51/32.png) [@discourse\_ai\_spam](https://community.nginx.org/u/discourse_ai_spam)\
**Post date:** [December 29, 2025, 10:29am UTC](https://community.nginx.org/t/tls-handshake-delays-and-performance-issues-on-specific-client-devices-nginx-troubleshooting/8706/2 "2025-12-29T10:29:15Z")

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**Author:** ![system](https://drob5swvtjqxg.cloudfront.net/user_avatar/community.nginx.org/system/32/19_2.png) [@system](https://community.nginx.org/u/system)\
**Post date:** [December 30, 2025, 12:36pm UTC](https://community.nginx.org/t/tls-handshake-delays-and-performance-issues-on-specific-client-devices-nginx-troubleshooting/8706/3 "2025-12-30T12:36:53Z")

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<div class="post-metadata">

**Author:** ![system](https://drob5swvtjqxg.cloudfront.net/user_avatar/community.nginx.org/system/32/19_2.png) [@system](https://community.nginx.org/u/system)\
**Post date:** [January 29, 2026, 12:37pm UTC](https://community.nginx.org/t/tls-handshake-delays-and-performance-issues-on-specific-client-devices-nginx-troubleshooting/8706/4 "2026-01-29T12:37:14Z")

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