I have about 25 excel spread sheets at about 1.2 MB each loaded into my power bi file. A new one is created just about every week. The tables in excel have different values every 15 seconds for about 3 days (10 to 20,000 rows). Each of these spread sheets are appended to one query in order to compare batches on the same line graph. Everytime I refresh my data sets it takes 30-45 minutes. Generally when I refresh I only change or add a few things to 1 of these 25 spread sheets and the rest stay constant. Is there any way to refresh certain datasets?
Or is the only fix to reduce the amount of rows in each of these tables in the excel tables before adding them to power bi?