Mview fast refresh taking longer than complete refresh

Hi there,
We have a mview which takes about an hour to refresh in complete mode. Created all the mview logs and refreshing via fast method but this takes longer.
When all the mview logs empty works fine as fast refresh and far far quicker as would expect. Tried upadting one of records on base table called todays_date which simply stores todays date to get around fast refresh restriction with sysdate.
Anybody any idea why so slow?
Also wondering if better approach. Thought about just having an aggregate table and processing the inserts in MLOG$_TRANS_TABLE via a merge statement. Also heard about change data capture.
Any thoughts/suggestions welcome.
Many Thanks

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>
We have some materialized view which are configured for Complete refresh and are being refreshed manually everyday in the morning. Some times we face this issue of the MV taking longer time than usual for refresh
>
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Mview fast refresh taking longer than complete refresh

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