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Per Period Metrics Slow Entering Data when using Group By


Article ID: 210557


Updated On:


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Slow Performance Using Group by in Per Period Metrics (Time Scale Value (TSV) updating values in the Modern User Experience (UX). This issue is especially noticed with larger projects. As the # of assignments, periods and per period metrics increase, more slowness is observed. 

When typing in data in Per Period Metrics fields, it can take a few seconds for the page to update after each data entry. There can be a refresh of the page (prior to clicking refresh) which can cause issues when typing in the next cell where those changes don’t get saved, or are only partially saved.


  1. Create a project with a 5 year duration
  2. Add about 120 team members
  3. Create at least one task and assign the 120 resources to the task
  4. Navigate to the Assignments tab of the project in the Modern UX
  5. Create a group by for “Resource”
  6. In View Options, set the following:
    • Per-Period Metrics: ETC
    • Periods: Months
    • Start Period: 2021-01
    • End Period: 2025-12
  7. Expand a resource to view the assignments beneath
  8. Type ETC values  (example: 20) for 2021-01
  9. Click Tab on the keyboard to go to the next ETC field for 2021-02 and Enter 20 ETCs  and click Tab

Expected Results: Data entered for each cell is saved

Actual Results: Sometimes, the data entered is not captured or only partially (IE only 2 of 20 ETCs is saved). This is because the page is refreshing after typing and moving to the next cell.

Note: It may require repeating step 9 multiple times to see this issue


Caused by DE60109


Release : 15.9.1


Databases: Oracle, Postgres, MS SQL Server


Fixed in 15.9.2

Workaround: Type slower and allow the page to fully refresh after each data cell entry