Application user is sitting in Remote area accessiing
wed based application saying that his one of his web
page(form) is taking longer time to submit/execute,
he says there were no problems till yesterday but this
problem started today only

As a DBA i know there are 4 database running on same
server but iam New oracle DBA i donot know which appliaction
or database he is using. My senior DBA says there are no
changes on database side or no parameters change,
no OS side change

Could any one tell me what are the different step by
step solution can i give to applicatuion user.what could
lead this type of problems

Tks in advance