Performance when using large tables

[Jenner]

I will take a good look again.
But my question is not about how to make parent-child relations…
Is about performance when using large tables (my customer table has 3000 records);
If I use Data Tables, all the records are uploaded at the beginning, right?
Using large amount of data, this spends minutes, instead of seconds, as desired.

Maybe this post reports the same issue, and I am not be able to find the solution.

Slow data loading from data table to app

I have over 20,000 rows in a data table. I need to be able to filter them based on user selected criteria, or display all of them if no criteria is selected. Using the to do list method of building a second form and displaying each row in a for loop takes 6 minutes to load. Any suggestions on how I can get instant display updates (or at least faster, like seconds rather than minutes)?

Thanks