>>>>I have a 350,000 records table. I have created a tag on DELETED() and another one on UPPER(myfield). From the command prompt, I can apply a filter and the browse is immediate. However, from a grid, when I apply a filter, the grid takes a while to response. Does that mean, the Grid and the Browse are 2 different controls? How can we obtain the same result in the grid when using a filter?
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>>>This is not first such question, and there is something wrong in grid/filtering. I cannot say by sure what, because I just made test opening 1 million record table (filtered) in grid and it worked perfectly fast. I would test your situation in separate form with one absolutely simple grid to make any conclusions.
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>>The grid appear immediately. But, when you will do a SET FILTER to something in your form, accessing the grid after will take a while.
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>Yes, I see, but still cannot reproduce it. I believe you have rushmore optimizable filter?

Yes.

In my case I have 2 tags. One on UPPER(myfield), which is excatly the syntax of the filter applied. The other tag is DELETED(). To make sure it was optimized, I run the same from the command prompt, using the filter, and it was immediate.