For some unknown reasons ,my browser open test pages of my remote server very slowly. So I am thinking if I can reconnect to the browser after quitting the script but don't execute webdriver.quit() this will leave the browser opened. It is probably kind of HOOK or webdriver handle.
I have looked up the selenium API doc but didn't find any function.
I'm using Chrome 62,x64,windows 7,selenium 3.8.0.
I'll be very appreciated whether the question can be solved or not.
Without getting into why do you think that leaving an open browser windows will solve the problem of being slow, you don't really need a handle to do that. Just keep running the tests without closing the session or, in other words, without calling driver.quit() as you have mentioned yourself. The question here though framework that comes with its own runner? Like Cucumber?
In any case, you must have some "setup" and "cleanup" code. So what you need to do is to ensure during the "cleanup" phase that the browser is back to its initial state. That means:

Blank page is displayed
Cookies are erased for the session
How can I reconnect to the browser opened by webdriver with selenium?