Arrow down to next line item and/or improve lag time between entries

When billing as a subcontractor there is a long lag time from when I enter a percentage to to when the amount populates. I will click down into the next line item and it won't enter because it is still populating the previous line item.

Additionally, it would be nice to be able to arrow down to the next line item to keep entries flowing smoothly.

Our pay apps can have a hundred or more line items. It takes a very long time to complete this when you have to click your mouse into the next section then wait for it to populate before you can keep going. Times this by the 10 different pay apps I have for our customer and it makes doing pay apps take 5x as long as it should.

I work in many different billing systems and this is the least user friendly one I deal with. Needs a LOT of work