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Set capability on already running selenium webdriver

In selenium test step (like a button click) i want to prevent the selenium waiting for page finish loading. I cant throw the load Exception because then i cant work with the page anymore.
Its possible to do a simmilar thing like this:
DesiredCapabilities dr = DesiredCapabilities.chrome();
dr.setCapability("pageLoadStrategy", "none");
WebDriver driver = new RemoteWebDriver(new URL("...."), dr);
What I want is like "dr.setCapability("pageLoadStrategy", "none");" but just for one specifique step.
Does anyone know a way to do this?

Capabilities are no longer editable once the browser is launched.
One way to temporary disable the waiting is to implement your own get with a script injection.
Something like this:
//
// loads the page and stops the loading without exception after 2 sec if
// the page is still loading.
//
load(driver, "https://httpbin.org/delay/10", 2000);
public static void load(WebDriver driver, String url, int timeout) {
((JavascriptExecutor)driver).executeScript(
"var url = arguments[0], timeout = arguments[1];"
"window.setTimeout(function(){window.location.href = url}, 1);" +
"var timer = window.setTimeout(window.stop, timeout);" +
"window.onload = function(){window.clearTimeout(timer)}; "
, url, timeout);
}

As of the current implementation of Selenium once we configure the WebDriver instance with our intended configuration through DesiredCapabilities class and initialize the WebDriver session to open a Browser, we cannot change the capabilities runtime.
It is worth to mention, somehow if you are able to retrieve the runtime capabilities still you won't be able to change them back.
So, in-order to make a change in the pageLoadStrategy you have to initiate a new WebDriver session.
Here is #JimEvans clear and concise answer (as of Oct 24 '13 at 13:02) related to proxy settings capability:
When you set a proxy for any given driver, it is set only at the time WebDriver session is created; it cannot be changed at runtime. Even if you get the capabilities of the created session, you won't be able to change it. So the answer is, no, you must start a new session if you want to use different proxy settings.

Selenium Grid - Unable to find elements on the 2nd page in IE11

I have some selenium tests that work great in Chrome (locally and remotely) but when I run them remotely from my machine to a Windows 2012 VM they can't find any elements AFTER clicking a button to move to the next web page.
Here is a code snippet:
DesiredCapabilities caps = null;
caps = DesiredCapabilities.internetExplorer();
caps.setBrowserName("internet explorer");
caps.setCapability(InternetExplorerDriver.ENABLE_PERSISTENT_HOVERING, false);
caps.setCapability(InternetExplorerDriver.IE_ENSURE_CLEAN_SESSION, true);
caps.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
caps.setCapability(InternetExplorerDriver.INTRODUCE_FLAKINESS_BY_IGNORING_SECURITY_DOMAINS, true);
caps.setJavascriptEnabled(true);
caps.setPlatform(Platform.WIN8);
String nodeURL = "http://0.0.0.0:5555/wd/hub"
driver = new RemoteWebDriver(new URL(nodeURL), caps);
// IE launches correctly, goes the cart page. Calculations are done on the pricing, and we click to move to the login page
driver.findElement(By.id("userName")).sendKeys("test#test.com");
// ^^ NoSuchElementException: Unable to find element with id == userName
So obviously there is a good connection made. Actions are performed and my tests move from the cart page to the login page. I even added a wait.until, hoping that it was a timing issue, but it timed out after 15 seconds. I'm watching the driver on RDP, it moved to the page. During the 15 seconds, I even opened the dev tools and checked to see if the element was there and it was.
What's going on? Thanks!

Preface: As a QA automation engineer, I hate IE.
It turns out that http://company.com was added a trusted site, but not https://company.com. Once I added that, it started working.
Did I mention I hate IE?

Using Selenium on https web application that runs over vpn

First of all, I need to state that I am total beginner with Selenium.
I am trying to test an application in firefox browser using Selenium. Due to security issues the application works only over vpn.
My problem occurs with the following steps; I create the webdriver and navigate to the start (login) page of application. I get an "Authorization request" popup. If I cancel the popup, then I get to a page that states "Connection is not secure" (it's https address). After I get passed that, I lose the part where Selenium program should populate username and password and it just stays on the login page.
My question, is there a way to start Selenium testing on an application so that it is already opened and prepared (ie logged in) in browser? I am not happy that username and password are hard-coded in Selenium code.
If that is not possible, how do I skip that authorization popup and problem with non-secure connection? How do I populate username and password in safest way?
Thanks!
public static void main(String[] args) {
System.setProperty("webdriver.gecko.driver", "C:\\Selenium-java-3.0.1\\geckodriver.exe");
// I tried also with this code bellow in comment, but it did not work, it did not even get to login page
//WebDriverWait wait = new WebDriverWait(driver, 10);
//Alert alert = wait.until(ExpectedConditions.alertIsPresent());
//alert.authenticateUsing(new UserAndPassword("cfadmin", "20lipim18"));
driver.get("https://Application_login_page.com");
driver.findElement(By.xpath(".//*[#id='login']")).click();
driver.findElement(By.xpath("[#id='login']")).sendKeys("Username");
}

if it's possible, is there a way to start Selenium testing on application that is already opened and prepared (logged) in browser?
Try using firefox profile. Since selenium open fresh instance of browser by default. You can use your own firefox frofile.
This is a code to implement a profile, which can be embedded in the selenium code.
ProfilesIni profile = new ProfilesIni();
// this will create an object for the Firefox profile
FirefoxProfile myprofile = profile.getProfile("default");
// this will Initialize the Firefox driver
WebDriver driver = new FirefoxDriver(myprofile)
It will also maintain the session means you are already login to the application in firefox(default profile). Then if you execute the script, you will see that you are already logged in to the application.

There is no way to open already authorised page, you have to have to pass username and password through selenium script.
You may use below code to do the authentication
WebDriverWait wait = new WebDriverWait(driver, 10);
Alert alert = wait.until(ExpectedConditions.alertIsPresent());
alert.authenticateUsing(new UserAndPassword(username, password));

PhantomJS slower than ChromeDriver, using Selenium

I'm trying to use PhantomJS 2.0/GhostDriver instead the ChromeDriver, since I have read I could speed up my UI tests.
This is the test code I'm running, as part of a Junit test:
#Override
public void runTestCase() throws Exception {
long startTime = System.currentTimeMillis();
// log in as admin
Login.loginAs("admin", "password");
System.out.println(System.currentTimeMillis() - startTime);
}
The loginAs function fills in the text fields for the username and password, then click on the submit button and finally moves in the home section of the new returned page.
Now, I'm running once a time this simple test using both Phantomjs and ChromeDriver as driver for Selenium in Java (v2.45).
They are initialized as follow:
ChromeDriver
System.setProperty("webdriver.chrome.logfile", workingDirectory + "\\chromedriver.log");
service = new ChromeDriverService.Builder().usingDriverExecutable(new File(workingDirectory + "\\chromedriver.exe")).build();
capabilities = DesiredCapabilities.chrome();
options = new ChromeOptions();
options.addArguments("--allow-file-access-from-files");
options.addArguments("--verbose");
capabilities.setVersion("");
capabilities.setCapability(ChromeOptions.CAPABILITY, options);
driver = new ChromeDriver(service, capabilities);
PhantomJS
System.setProperty("phantomjs.binary.path", workingDirectory + "\\phantomjs.exe");
cliArgsCap = new ArrayList<String>();
capabilities = DesiredCapabilities.phantomjs();
cliArgsCap.add("--web-security=false");
cliArgsCap.add("--ssl-protocol=any");
cliArgsCap.add("--ignore-ssl-errors=true");
cliArgsCap.add("--webdriver-loglevel=INFO");
cliArgsCap.add("--load-images=false");
capabilities.setCapability(CapabilityType.SUPPORTS_FINDING_BY_CSS, true);
capabilities.setCapability(CapabilityType.TAKES_SCREENSHOT, true);
capabilities.setCapability(PhantomJSDriverService.PHANTOMJS_CLI_ARGS, cliArgsCap);
driver = new PhantomJSDriver(capabilities);
I'm running my test on a 64bit Windows 7 machine. So, having a look the time took by the test, I always note that ChromeDriver is faster than PhantomJS. Always. For instance, if the test with ChromeDriver takes about 3-4 seconds, the same with PhantomJS takes about 5-6 seconds.
Has anyone experienced with this issue? Or could anyone give me any reason for that? Am I setting something wrong?
Furthermore, if you need more details, let me know.

I have found that this setting uses a lot of memory that seems to keep growing:
cliArgsCap.add("--load-images=false");
But when I use this setting the memory usage is stable:
cliArgsCap.add("--load-images=true");

"PhantomJS is a headless WebKit scriptable with a JavaScript API" as it's explained on the main page of the project.
Google split from WebKit to create Blink to use it in Chrome.
What are the main differences between them - unfortunately I'm not the expert here.
I run one of my really long scenarios both on Chrome and PhantomJS and to my surprise the difference was pretty significant:
PhantomJS - 583.251 s
Chrome - 448.384 s
Using PhantomJS doesn't bring performance benefits in my case but running tests headless does. I can use machine without graphical desktop and save computing power for some additional threads.

The slowest aspect of a web page is the downloading of html, JavaScript, css, images, etc and making AJAX request.
To anybody who says Headless is faster, how can headless address any of these?

Selenium WebDriver FirefoxBinary#startProfile

What is the point of the method FirefoxBinary#startProfile?
How would one control a browser opened using the above method?
FirefoxBinary binary = new FirefoxBinary(new File("path\\to\\binary.exe"));
String profilePath = "path\\to\\profile";
FirefoxProfile profile = new FirefoxProfile(new File(profilePath));
binary.startProfile(profile, profilePath, "");
//A browser opens at this point, but how do I send it commands or attach
//it to a WebDriver?

The purpose of the method is to do exactly what it does: start an instance of Firefox using the specified profile. WebDriver makes a copy of the profile in the temp directory and adds the WebDriver Firefox extension into this copy of the profile. Th startProfile method launches Firefox, making sure to clean up the profile so that it's usable by the new instance. If you know what port the browser extension that gets added to the profile is listening on, you could connect to it and control the browser using the WebDriver JSON wire protocol commands.
However, unless you really know what you're doing, this is the complicated way to do it. You're far better off calling the FirefoxDriver constructor, passing in the FirefoxBinary object, and letting the internals of the constructor call the startProfile method for you.