isElementPresent is very slow in case if element does not exist.

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Here you are missing somethings that is why it is waiting If there is not element. findElement will wait for an element implicitly specified time. so need to set that time to zero in that method.

isElementPresent(WebDriver driver, By by) {  
    driver.manage().timeouts().implicitlyWait(0, TimeUnit.SECONDS);  
    try {  
        driver.findElement(by);  
        return true;  
    } catch (NoSuchElementException e) {  
        return false;  
    } finally {  
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);  
    }  
}

There are 4 important things going on here. In order:

  1. Setting implicity_wait to 0 so that WebDriver does not implicitly wait.

  2. Returning True when the element is found.

  3. Catching the NoSuchElementException and returning False when we discover that the element is not present instead of stopping the test with an exception.

  4. Setting implicitly_wait back to 30 after the action is complete so that WebDriver will implicitly wait in future.

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