# Bug OP-20723 - Gantt Charts using up browser resources and loading very long

Project: OpenProject
Status: new
URL: https://community.openproject.org/work_packages/OP-20723

## Open points

_No work packages_

## Details

| Attribute | Value |
| --- | --- |
| Date |  |
| Priority | Medium |
| Module | Modules and project features / Gantt view, Performance |
| Target versions |  |
| Observed in versions | 17.8.0 |
| Sprint |  |
| Backlog bucket |  |
| Bug found in version (deprecated) |  |
| Found in mobile app version |  |
| Follow-up feedback e-mail |  |
| Requires doc change | No |
| Accessibility | No |
| Pull preview |  |
| List |  |
| Labels |  |

## People

| Attribute | Value |
| --- | --- |
| Assignee | Sebastian Cohnen |
| Accountable |  |
| Product manager |  |
| Developers |  |
| Designer |  |
| Ordered by |  |
| Signed off by |  |
| Interest by |  |

## Planning

| Attribute | Value |
| --- | --- |
| Relevance |  |

## Costs

| Attribute | Value |
| --- | --- |
| Votes |  |
| Work |  |
| Labor costs |  |

## Description

### Steps to reproduce

1.  On a PC with 8gb RAM open a project with more than 100 work packages (the more the better. Firefox is worse, but also edge and chrome was tested)
    
2.  Go into the Gantt-Chart Module
    
3.  Experience loading time
    
4.  Choose a pagination of >=100 work packages
    

### What is the buggy behavior?

1.  loading time up to a minute / sometimes freezes application
    
2.  The page/tab with the loaded gantt chart seems to be using 1GB+ of memory if it's loading at all (as shown in Edge's Activity Monitor)
    
    1.  with pagination of 20 it was also very slow (10+ seconds)
        

### What is the expected behavior?

1.  Loading time should be within a usable limit
    

### Environment information

_17.8.0_

**OpenProject installation type**

*   [x] On-Premise

**OpenProject version**

_17.8.0_

**Browser**

*   [x] Chrome
*   [x] Firefox
*   [x] Safari

**Operating System**

*   [x] Windows

<br>