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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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Apr 05, 2011
Hi Chris,

 

 

Sorry for giving a bad recommendation. I didn't know about the AES::encrypt issue that Spark pointed out. I think the HTTP profile option to encrypt cookies should work for your scenario.

 

 

It would be great if you could open a case with F5 Support and request to be added to the AES::encrypt bug ID, 224113. This will help raise the visibility of the issue internally.

 

 

Thanks, Aaron