Slow groups load on web authentication

I have authentication using Directory Assistante and DSAPI, after the user is logged, I found that the user does not have load all the groups that it belongs to.

Using webauth_verbose_trace=1 I have found this

WebAuth> GroupCache: WildCard Name=‘*’

WebAuth> GroupCache: Hierarchical Name=‘*/OU=AU/O=CPI’

WebAuth> GroupCache: Hierarchical Name=‘*/O=CPI’

WebAuth> GroupCache: Cached for User DN=‘CN=Julie Smith/OU=AU/O=CPI’

after about 1-5 minutes, I refresh my page and now I see

WebAuth> GroupCache: WildCard Name=‘*’

WebAuth> GroupCache: Hierarchical Name=‘*/OU=AU/O=CPI’

WebAuth> GroupCache: Hierarchical Name=‘*/O=CPI’

WebAuth> GroupCache: Group Name=‘EESPICountryAdmin’

WebAuth> GroupCache: Cached for User DN=‘CN=Julie Smith/OU=AU/O=CPI’

There is a new “EESPICountryAdmin” group loaded…

Any idea why is doing this ? Why it takes that 1-5 minutes ?

Thanks !!!