SQL server taking 90 to 95% of cpu usage.....

Hi ...

i'm using Nop 2.2....

and my database contains 20,000 products....

now i've added 15,000 more products using some(custom) stored procedures...
and entered appropriate value in particular table....

My problem is that....when i connect my old database means contains 20,000 products ....it works perfectly....

but when i connect new database means contains 35,000(20,000+15,000) products ...

suddenly SQL server taking 90 to 95% of cpu usage.....


so What could be the reason behind this....????


Thank You...