record limit

[ReluctantProgrammer]

Often the table above has more than 300 added rows/entries and it is taking about 45 seconds for the staff to be able to enter something and then click in another fillable box. There are calculations in the total fields but they are simple sums. Could it be there are just too many entries?  Is there a recommended limit to the number of entries/additions to a form.

[Siva_Sogalapalli]

could you please add more info like how this table is created? is it a form on page? etc..

[ReluctantProgrammer]

My apologies, I meant to post this under Forms.  

This is a simple expandable table on a form.  There are actually 3 such simple tables but only the one shown in my original question has any calculations.  It makes sense there would be a suggested limit to the number of records so as not to slow down the functionality but I could find nothing on it.