I think it needs sometime "and also Luck" to get response from the companies through recruitment sites.
It’s true that you get bored after applying several times without getting something in return, and the same thing happened to me through Bayt, Monster,...etc. And you maybe applied for 100 job but you see only 30-40 of the companies has viewed your resume!
But, I do agree with the guys for what they said above about refreshing the CV and keep applying for the jobs day after day, cos you never know when luck hits you

Luck to all