Is it necessary to remove any Request attributes?

Would it make noticeable slowdown in my application if I don't remove it? Would it add extra overhead to my app? Or is it destroyed sometime in my application? Thanks!

Generally, don't worry about it. The request will go out of scope when the response is sent back to the client. At that time, any scoped variables (attributes) will be subject to garbage collection rules.

Because session and application scopes stay around longer, you need to be mindful of variable life-time in those scopes, but for page and request scopes, it's not usually an issue.

Some servlet containers maintain an object pool of request objects, so the content won't be collected. However in this case servlet container has to assure that request looks like freshly created.

Thanks for your inputs guys