Taking much time to load

i dont know why but nginx is taking much time to load, i am just running a single wordpress website and it is taking 2 minutes to load a single page,
i have used but it never took more than 3 sec for loading a single page

Any solution to this ?

i read on my blogs and posts that nignx is much faster than apache but why it is taking too much time to just load a singlr page :(


Some details :
worker_connections 768
server_names_hash_bucket_size 64;

i have average visitors of 100 per day