Silvio,

I've never seen Rushmore adversely affected by too many tags. All that does is increase the size of the CDX which would make it do more I/O to read it, but not the amount of slowdown that you were seeing. Are you sure SDT didn't readd an index that had been accidently removed before?

>I found that an index had been added to the table.
>Originally there were a bunch of tags, among them one called IDBASE expression IDBASE. This is the primary key.
>The added tag had as an expression IDBASE + dtoc(DATAOP). Don't remember the name but had nothing to do with the others. Removing this tag solved all the problems.
>
>Now, is it possible that VFP gets so easily confused? I had reindexed the table (using SDT) before and after the change so I can rule out an indexing problem.