Its interesting what you say because I have seen other programs other than the one I use start to develop the same problems of delayed timing but only since upgraded versions have been installed, more bells and whistles as you say.
I am having problems with one of my computers at the moment due to ram, but before that it was running fine and had done of many years but it was due to I think the amount of space on the operating system hard drive which slowed the processing power. Even though the program was on an different hard drive it still effected it. I have reformated the whole computer hard drive and have only two partitions in it now. With the ram problems fixed ( I hope ) I will start testing the program to see if it misses any laps with the computer cleaned up. Will get back to you. I haven't change the program because there is nothing wrong with it the reason I know is that the same version is in the second computer and it has been running fine since TCS last year.