most CPU/ RAM efficient methods for ranges

Over time, I've received incredible help from members of this forum. With that help I've built a workbook which meets my needs. (Thank you!)

Now I want to make it as CPU/RAM efficient as possible, given that my computer isn't hugely powerful.

Because I work with static .csv files, I've created a "template" workbook with multiple tabs. I paste the .csv files into a "Paste Data" tab in the template.

The other tabs in the workbook have about 35 columns with formulas and precedents, all of which are often involved in thousands of "Solver" iterations. And that's the challenge... how to recalculate all the cells as quickly as possible.

In column A of the worksheets where excel does the calculations, my formula is =if('PasteData'!A1>0,'PasteData'!A1,"")

From there, many of the other columns in theses worksheets will have formulas which begin with =if(A1="","", (rest of formula). Or sometimes I'll put the calculated # of rows in $G$3, then use =if(ROW()>$G$3,"",(rest of the formula)

So.... would changing over to dynamic range names improve calculation speed? (I've rarely used range names so I'm not familiar with their advantages/limitations).

Thanks!