It would be best if you started a new thread for this question. You will get more attention to it and you'll be able to provide more details.

Could you provide the table definition (even if you change the names). Some sample data and the expected outputs. I'm thinking at the moment that you could do a first select statement that would do the 100 calculations and insert that data in a temp table. Then you could do your updates/inserts using that temp table. It should run 10/50 times faster that way.