Cypress tests slow down or fail, UI is unresponsive in 3.3.1

Current behavior:

I noticed the some of our API, mainly XHR requests were continuously getting looped indefinitely when i upgraded Cypress from 3.2.0 to 3.3.0. So we rolled it back. Now we hit some other bugs, for which we wanted to upgrade to Cypress 3.3.1, once again i am getting a similar issue.

1. For some of the tests some XHR requests are loading indefinitely.
2. The Timer is not incrementing
3. The Test Runner is not responding

------------ Configuration -------
{
animationDistanceThreshold: 5,
baseUrl: null,
blacklistHosts: null,
chromeWebSecurity: true,
defaultCommandTimeout: 20000,
env: {
CLIENT: 'demoaccount',
failOnSnapshotDiff: false},
execTimeout: 60000,
fileServerFolder: '',
fixturesFolder: 'cypress/fixtures',
hosts: null,
integrationFolder: 'cypress/integration',
modifyObstructiveCode: true,
numTestsKeptInMemory: 1,
pageLoadTimeout: 60000,
pluginsFile: 'cypress/plugins',
port: null,
reporter: 'spec',
reporterOptions: null,
requestTimeout: 5000,
responseTimeout: 30000,
screenshotsFolder: 'cypress/screenshots',
supportFile: 'cypress/support',
taskTimeout: 60000,
testFiles: '**/*.{spec.js,feature}',
trashAssetsBeforeRuns: true,
userAgent: null,
video: true,
videoCompression: 32,
videoUploadOnPasses: true,
videosFolder: 'cypress/videos',
viewportHeight: 660,
viewportWidth: 1000,
waitForAnimations: true,
watchForFileChanges: true}
-----------

Scenario failing- Validating the time/date picker yields a correct date in the calendar while scheduling email message (we are using cucumber library)

Desired behavior:

Things are fine in 3.2.0, except some known issues like forwarding of socket failures related error in HTTP api level, which causes some parse error (Internal Error 500) in cypress.

Steps to reproduce: (app code and test code)

I am sharing some snippet of the login code, which we use to login.

Cypress.Commands.add(
	'login',
	{
		prevSubject: 'true'
	},
	(client, user) => {
		cy.logout();
		return cy.visit(`${BASE_URL}`).then(() => {
			return cy.getCookie('csrftoken').then(({ value }) => {
				return cy
					.request({
						url: `${client.url}/accounts/login`,
						form: true,
						method: 'POST',
						body: {
							username: client.users[user].email,
							password: client.users[user].password,
							csrfmiddlewaretoken: value
						}
					})
					.then(() => client);
			});
		});
	}
);

Versions

cypress - 3.3.1 electron - 61 OS - Mac OS Mojave 10.14.5

Attachments

cy_3.3.0_debug.log cy_3.3.1_debug.log

[flotwig]

@joydeep100 Let’s move discussion of this issue to #4668, since the history of this issue has become about something else. I thought we fixed the issue you’re experiencing in 3.3.2, but apparently I reproducing another potential cause of XHR flakiness all along 😛

[jennifer-shehane]

@joydeep100 Yes, this issue was intended to be completely fixed in version 3.3.2.

@flotwig can you take a look at the HAR file?