Job Security

So the company I work for picked up a huge contract.
They did not know it at the time but, 1/3 of the data are huge excel spread sheets (over 1TB total and over 1 million excel files) .
The application they had developed in house was taking 2-8 hours to process each excel file and they have a due date at the end of next month.
So I fixed it to bring that time down to 6-8 minutes per excel sheet, with more speed optimization that I can do. So when I am done fixing everything, the company will be able to take on more contracts at the same time and make more money.
BAM! POW!
Any way I feel good about it, my boss likes it a lot, my boss' boss likes it a lot, the people that work on the excel files like it a whole lot and the CEO personally thanked me.

Any way, that relieves me of some stress and gives me a bit of job security.