My localhost Still Very Very Slow query response from Mongodb.. response time 19999ms or more. how

[Alone Bala]

I have run mongodb collection run localhost:3000 .upto day before no problem..but suddenly last two days  local host run very slow.. first time run my web service in browser not get a response when i terminate cmd window at that time i got response.

  i don;t know why...kindly help me.

  Thanking you