Utilize cypress to analyze the loading time of a webpage

Question

Utilize cypress to analyze the loading time of a webpage

My current challenge involves using cypress to carry out website tests. I am looking for a reliable method to measure the duration it takes for certain cypress commands to load or execute. As an example:

//var startTime = SomeStopwatchFunction();
cy.visit("/a website");
cy.get("Some item");
//cy.log(SomeStopwatchFunction - startTime);

I attempted to utilize cy.clock(), but it consistently returns 0, indicating that I may be making a mistake there. While performance.now() seemed somewhat effective, it always yields the same value regardless of the loading time. Additionally, Date.getTime() also provides me with 0. The issue likely stems from how cypress executes the code, as none of these methods seem to deliver the desired outcome.

typescript performance integration-testing cypress

Answer 1

Answer №1

One of the easiest methods for timing the page load is by utilizing the events provided.

This approach eliminates the need to be concerned about hook codes such as before() or other setup commands that are typically required in testing scenarios.

cy.visit('http://localhost:3000/#/users', {
  onBeforeLoad: (win) => {
    win.t0 = performance.now()
  },
  onLoad: (win) => {
    t1 = performance.now()
    cy.log(`The page took ${t1 - win.t0} milliseconds to load.`)
  },
})

Answer 2

One of the easiest methods for timing the page load is by utilizing the events provided.

This approach eliminates the need to be concerned about hook codes such as before() or other setup commands that are typically required in testing scenarios.

cy.visit('http://localhost:3000/#/users', {
  onBeforeLoad: (win) => {
    win.t0 = performance.now()
  },
  onLoad: (win) => {
    t1 = performance.now()
    cy.log(`The page took ${t1 - win.t0} milliseconds to load.`)
  },
})

Answer 3

Answer №2

If you are measuring actions that occur asynchronously in Cypress, it is important to ensure your timing commands are placed in the queue using cy.wrap().

Otherwise, these commands may execute before the page fully loads, resulting in inaccurate measurements.

const startTime = performance.now()
cy.visit("/a website");
cy.get("Some item");
cy.wrap(performance.now()).then(endTime => {      
  cy.log(`Page load took ${endTime - startTime} milliseconds.`);
})

Answer 4

If you are measuring actions that occur asynchronously in Cypress, it is important to ensure your timing commands are placed in the queue using cy.wrap().

Otherwise, these commands may execute before the page fully loads, resulting in inaccurate measurements.

const startTime = performance.now()
cy.visit("/a website");
cy.get("Some item");
cy.wrap(performance.now()).then(endTime => {      
  cy.log(`Page load took ${endTime - startTime} milliseconds.`);
})

Answer 5

Answer №3

The solution provided by user9161752 in the accepted answer may produce unexpected outcomes. In my experience, the duration is consistently 5 seconds longer than expected. This discrepancy appears to stem from the fact that const t0 = performance.now() is being called prior to the execution of tasks within beforeEach, resulting in the inclusion of the login process duration in the final result.

To address this issue, it is necessary to set the start time asynchronously. The following approach worked for me:

let start = 0;
cy.then(() => {
    start = performance.now();
});
cy.visit("/desired-website");
cy.get("Specific element").then(() => {
    cy.log(`elapsed time: ${performance.now() - start} ms`);
});

Answer 6

The solution provided by user9161752 in the accepted answer may produce unexpected outcomes. In my experience, the duration is consistently 5 seconds longer than expected. This discrepancy appears to stem from the fact that const t0 = performance.now() is being called prior to the execution of tasks within beforeEach, resulting in the inclusion of the login process duration in the final result.

To address this issue, it is necessary to set the start time asynchronously. The following approach worked for me:

let start = 0;
cy.then(() => {
    start = performance.now();
});
cy.visit("/desired-website");
cy.get("Specific element").then(() => {
    cy.log(`elapsed time: ${performance.now() - start} ms`);
});

Answer 7

Answer №4

For my specific situation, I needed to accurately measure the page load time immediately after a click event. To achieve this, I crafted the following script:

cy.get(loginLoginBtn).should('exist').then(() => {
        const startTime = performance.now();

        cy.get(loginLoginBtn)
        .click()
        .location('pathname').should('eq', '/package_selection')
        .wait('@recentProfiles').its('response.statusCode')
        .should('eq', 200)
        .then(() => {
            const endTime = performance.now();
            const pageLoadTime = ((endTime - startTime) / 1000);
            cy.log(`Page load took ${pageLoadTime} seconds.`)
            cy.writeFile(packagePageLoadFile, '[]', {flag: 'w+'});
            cy.readFile(packagePageLoadFile).then((writeTimeToFile) => {
                writeTimeToFile.push({dateOfExecution: executionDate, timeInSeconds: pageLoadTime});
                cy.writeFile(packagePageLoadFile, writeTimeToFile);
            });
            expect(pageLoadTime).to.be.lessThan(5);
        })
    });

Answer 8

For my specific situation, I needed to accurately measure the page load time immediately after a click event. To achieve this, I crafted the following script:

cy.get(loginLoginBtn).should('exist').then(() => {
        const startTime = performance.now();

        cy.get(loginLoginBtn)
        .click()
        .location('pathname').should('eq', '/package_selection')
        .wait('@recentProfiles').its('response.statusCode')
        .should('eq', 200)
        .then(() => {
            const endTime = performance.now();
            const pageLoadTime = ((endTime - startTime) / 1000);
            cy.log(`Page load took ${pageLoadTime} seconds.`)
            cy.writeFile(packagePageLoadFile, '[]', {flag: 'w+'});
            cy.readFile(packagePageLoadFile).then((writeTimeToFile) => {
                writeTimeToFile.push({dateOfExecution: executionDate, timeInSeconds: pageLoadTime});
                cy.writeFile(packagePageLoadFile, writeTimeToFile);
            });
            expect(pageLoadTime).to.be.lessThan(5);
        })
    });

Answer 9

Answer №5

Check out the cypress-timings tool for detailed timing information on each cypress command. Installation is simple - just add the code snippet below to your support/index.js:

import { commandTimings } from 'cypress-timings'
commandTimings()

Answer 10

Check out the cypress-timings tool for detailed timing information on each cypress command. Installation is simple - just add the code snippet below to your support/index.js:

import { commandTimings } from 'cypress-timings'
commandTimings()

Utilize cypress to analyze the loading time of a webpage

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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