Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Chris_Huston_16's avatar
Chris_Huston_16
Icon for Nimbostratus rankNimbostratus
Mar 28, 2011

iRule performs 100x slower under load

Hello,   I have an iRule (BIGIP v9.4.8) whose HTTP_REQUEST timing performance drops by 100x when under load. How can I diagnose what's happening? Under what conditions can an iRule slow down (in t...
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Colin_Walker_12's avatar
Colin_Walker_12
Historic F5 Account
Mar 31, 2011
Without knowing more about what's actually happening inside the iRule tracking this down is going to be tough. I realize you can't post the entire rule, but any details you can provide would be extremely helpful. Which commands are being used, which events they're being used in, context (client vs server), etc.

 

 

Colin