Worksheet Change Causes Three Second Delay

I don't know any way ask this question without attaching an example. But the problem itself is pretty easy to explain. On the attached worksheet, whenever anyone makes a change to the information in column C (labeled as Act. Chicks) this triggers a worksheet change that makes that cell have a red font. It also triggers a routine (in a standard module) that updates textboxes that continually display a running total.

Here is the problem: After the information is entered, and the routines have finished executing, there is an incredibly annoying delay of about three seconds. That is, it takes three seconds before you can even select a different cell. This is very difficult for the user to deal with, especially when she has a great deal of information that she would like to enter very quickly. What is strange to me is that if I run the routine for the Worksheet Change within the VBE, I get the delay after the last line of the code (in the standard module) has been executed. In other words, I can't see any code that is running during this long "pause." What is the computer doing during this time, and what can I do to fix it?