Constant VUs
Set constant VUs to simulate steady load and assess performance in BrowserStack.
Depending on your preferred method, select any one of the following to set constant virtual users:
Configure Constant VUs Load Profile
Select Constant VUs from the dropdown menu, and set the number of virtual users, and test duration.

- Virtual Users: Enter the total number of users to simulate during the test.
- Duration: Specify how long the test should run (in minutes, seconds, or a combination of both).
Configure Constant VUs load profile
Set vus to the maximum number of virtual users to simulate during the test.
The max limit for this config is currently 100. Contact us if you want to increase this limit.
Before running a full-scale load test, do a sanity check with a small set of virtual users to validate your configuration and test stability.
Set duration
Each virtual user (VU) repeatedly executes the test(s) in a loop until the specified duration ends.
How to set duration values:
- If less than 1 minute: use seconds (
_s), e.g.,45s - If less than 1 hour: use minutes and seconds (
_m_s), e.g.,12m30s,10m - If 1 hour or more: use hours, minutes, and seconds (
_h_m_s), e.g.,1h5m20s,1h17m,1h
vus: 5
duration: 5m
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Contact our Support team for immediate help while we work on improving our docs.
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