Low performance on vitest version 3.0

[arnold095]

Describe the bug

Hello!

After upgrading vistest to the latest version, I have noticed that there is a significant drop in runtimes without having changed any additional settings.

With vitest 2.1.8

After update to vitest 3.0.0

Reproduction

I have a very large test battery, probably not reproducible with few tests.

#7275 (comment)

System Info

System:
    OS: macOS 15.0.1
    CPU: (8) arm64 Apple M1
    Memory: 881.17 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.9.0 - ~/.nvm/versions/node/v20.9.0/bin/node
    Yarn: 4.1.1 - ~/.nvm/versions/node/v20.9.0/bin/yarn
    npm: 10.1.0 - ~/.nvm/versions/node/v20.9.0/bin/npm
  Browsers:
    Brave Browser: 131.1.73.105
    Chrome: 131.0.6778.265
    Safari: 18.0.1

Used Package Manager

yarn

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[github-actions]

Hello @arnold095. Please provide a minimal reproduction using a GitHub repository or StackBlitz (you can also use examples). Issues marked with needs reproduction will be closed if they have no activity within 3 days.

[sheremet-va]

Interesting how tests time spiked 🤔 These are the "test" callbacks

[sheremet-va]

Can you test different vitest beta versions? Does it become worse in a specific one?

[arnold095]

@sheremet-va

These are the results, it seems that the performance drop originates in version 3.0.0-beta.2

With vitest 3.0.0-beta.1:

With vitest 3.0.0-beta.2:

Vitest 3.0.0-beta.3:

Vitest 3.0.0-beta.4:

Vitest 3.0.1:

[sheremet-va]

Looks like this is the cause: #6944

[AriPerkkio]

Repro at https://github.com/vitest-tests/reporters-large

Using Ecosystem CI:

• v3.0.0-beta.1: > node ./run-tests.mjs Tests took 16.816404, https://github.com/vitest-dev/vitest-ecosystem-ci/actions/runs/12829832609/job/35776695576
• v3.0.1: > node ./run-tests.mjs Tests took 27.028139, https://github.com/vitest-dev/vitest-ecosystem-ci/actions/runs/12829764103/job/35776484756