Unexpected Login Delays After Upgrading FusionAuth

[stevediaz]

Hello

I recently upgraded my FusionAuth instance to the latest version & since then, I've been experiencing noticeable login delays. Previously; user authentication was nearly instant, but now there’s a 3–5 second lag before users are redirected after entering their credentials.

This delay occurs even with local accounts & there haven't been any significant infrastructure changes on my end.

I've checked the server logs and database queries, but nothing obvious stands out. Could this be related to session handling, rate limiting / a new background process introduced in the update? Has anyone else faced similar slowdowns after upgrading?

I'm looking for suggestions on where to investigate next—whether it's related to database performance, API rate limits, or something else. Checked https://fusionauth.io/docs/operate/secure-and-monitor/monitor- Machine Learning guide related to this and found it quite informative.

Any debugging tips or insights would be greatly appreciated! If there are specific configurations I should check or roll back, please let me know.

Thanks!

[mark.robustelli]

@stevediaz Seems odd that an upgrade would delay the redirection. What browser are you using? Have you tired using another? Have you used something like the Chrome network monitor to narrow down where the delay is happening?