Perhaps radius server is not replying very fast. You can increase the number of workers with children global parameter, but if radius server is slow, it will still get call routing delays.
You can use benchmark module to see how long it takes to execute an action in kamailio.cfg -- do it for the ones involving radius.
DBG_F_MALLOC doesn't introduce a noticeable performance effect.
Anyhow, this is not a report of an issue, but rather discussion to see if there is an issue. Such conversation belongs to sr-users mailing list -- I am closing here, start a discussion on sr-users if you want more feedback on this topic.
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