Slow performance whith user form matrix using UserDataSources

Hello,
I have a matrix with ~5 columns for weeks OR ~30 columns for days. I´m using UserDataSources and it is very slow to fill the matrix, it takes ~0.8 seconds per line with 5 columns and ~1.7 seconds per line with 30 columns (with no over head of values calculation).
I tried using a auxiliary User Table to be able to use DBDataSources but improves only 4 seconds (with 5 columns, from 12 seconds of the userdatasources) to 10 seconds (with 30 columns, from 50 seconds of the userdatasources) in my small test of only a dozen lines.
With the over head of the calculation (using RecordSets to read values from other tables) it is very slow.
I have read other answers in the forum and they say to use datasources but that is wath i am doing!
Any suggestions, PLEASE?
Jorge Lopes

Edward,
Had already seen it, but thank you for the answer anyway.
I would like to know if the times i gave are normal or to slow (anyone from SAP?).
I saw a post where they said they filled 1000 lines with 8 columns in 7 seconds, must be only DBDataSource not with UserDataSources!!!
Jorge Lopes

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