keyboarding slows lots when 75 page table used for timekeeping purposes

[boatbody]

Forgive if I have asked for help that has been discussed before. I'm a newbie.


I have lengthy 75 pages of MS Word tables that I've crafted into crude timekeeping system for work. Its main function is that it must sort by three columns. Lately when I type in a new row, it goes very slowly, the words appear one, two or three seconds after I type them and the sorting function takes a very long time, much longer than a few months ago when the doc was perhaps 70 pp. Yet on other documents -- letters, pleadings, where there are no tables, everything works appropriately.

Ideas for fixing this problem -- other than the obvious about buying a commercial software package for timekeeping?