Which is best and why? To resign because you are no longer motivated in your job or to stay knowing that your performance will not be optimal?

It happens sometimes best talented and top performers stay idle, simply because there are no real challenge that matches thier capacity, and normally managers tend not to give simple tasks to this type of employees, this may lead to the situation of the question that the employee thinks his/her performance is not optimal forgetting that they are an asset to the company, although they are not optimally utilized but still remains counted as asset and part of the company's capital, hence, in such a situation I would say stay in your job, utilize your idle time to come with pro-active inititives and/or explore new areas withing the company that may widen your horizon.

Cheer up "Only top performers think that thier performance is not optimized"

I don’t think its a good idea to leave a job because of motivation. Successful people always stay up because of their self motivation skills. What if you get an other job and after a while  the new job no longer be motivating you. Lets spice up your job with passion and wait for an opportunity that is parallel to your skills and matches your interests. Its not that you like your job, it is that you "love" your job.  

No matter how much desparate you are, do consider the following;

1 - Do complete your notice period.

2 - Never complain or write -ve comments in your resignation.

3 - You may mention the you have have another better opportunity.

4 - During probation period, do not be absent from the duty.

5 - Never ignore your working.

6 - Ensure that you are avaliable for maximum support.

That's what i have learn during my HR experience.

It depend upon alternatives, if you do have alternatives to meet your current financial needs then go ahead with the resign otherwise search the alternatives and stay focus on what you currently do irrespstive of apraisal.

What I do in such a situation is that I resign but it is not good. I actually do it after trying my best and try to create challenges and learn from what I have. The disadvantage of it, which recruiters don't understand is, is that you look like a quitter and that you never settle in a job. On the other side, the people who just stay for the sake of having a job, I consider it like committing a career suicide. 

Leaving a job because you are not motivated and without finding another one is a big mistake. Self motivated people will always find a way out till they find their next challenge.

i prefer to leave and fine another chealanging and motivative track , cause if im used to have optimal performance i will not be useful for my current company or any other

At first u must know ur intrest.like what typ of job intrest u. n widout intrest u cant move ahead anywhere.its not about money bt intrest n passion.clear ur confusion first.

U think u can do better in other job then first get dat job n then resign,one should keep their options open.

If you don’t have passion, then you have no motivation. If you don’t believe in what you are doing, why would anyone else?

The best thing to do in this case is to look for alternatives.

Since the question points out in a employee perspective, then frankly speaking what is the use of staying if the employee can't performed well and later the employee might just become a liability in the long run...so resigning would be the choice.But again, leaving the company is not the best choice because the company also invested on people so the employee before makes a decision...ask what makes him/her demotivated and he/she should tell the employeer, if they act and help the employee overcome the impedements then the employee should do his/her best to fill in the gaps and stay motivated.

So this is a tough one. Ultimately an individual should know what’s best for himself/herself and most do. However, it is difficult to put what’s best for the company in the forefront when there could be a number of reasons for low employee contribution. In order to say which of these options are best we would need to identify what is the cause.

As a manager, I try to stay involved as much as I can with staff to better know them and their ups and downs. With that said, I believe in encouraging the individual, and sometimes that means assisting them with new job placement. Either way, I believe that it is important for a manager to recognise these dips, and react in the most positive way possible.

So the best choice is the most informed and supported choice.