Selenium testing without browser

I use Selenium RC for testing. Now to perform a load test, I want to run parallel test cases. Is there any way to run them without opening a browser?

Chrome now has a headless mode:

op = webdriver.ChromeOptions()
op.add_argument('headless')
driver = webdriver.Chrome(options=op)

To set up on Centos (do all installation as root)

Install pip Download https://bootstrap.pypa.io/get-pip.py

python get-pip.py

Installing selenium If you have pip on your system, you can simply install or upgrade the Python bindings: pip install -U selenium

Alternately, you can download the source distribution from PyPI (e.g. selenium-2.53.1.tar.gz), unarchive it, and run:

python setup.py install

install the program: pyvirtualdisplay

pip install pyvirtualdisplay

yum install Xvfb libXfont Xorg

Then modify your script to add the bold lines within ** and **

**from pyvirtualdisplay import Display**
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException
from selenium.common.exceptions import NoAlertPresentException
import unittest, time, re

class SeleniumDemo(unittest.TestCase):

    def setUp(self):
        **self.display = Display(visible=0, size=(800, 600))
        self.display.start()**
        self.driver = webdriver.Firefox()
        self.driver.implicitly_wait(30)
        self.base_url = "http://www.soastastore.com/"
        self.verificationErrors = []
        self.accept_next_alert = True


    def tearDown(self):`enter code here`
        self.driver.quit()
        ***self.display.stop()***
        self.assertEqual([], self.verificationErrors)

You can run Selenium headless, take a look at this question/answer: Is it possible to hide the browser in Selenium RC?

Especially for performance load tests, you should have a look at Apache JMeter.