Slow performance when using Gantt

[Yossi]

Hi,

We are trying to upgrade a project we have previously made in VB and used your COM components to WPF and we are having seriously performance issues when the screen have a lot of Gantt entries (1000+)

I've attached a sample application that demonstrate the issue.

Regards,
Yossi

[Christopher]

Hello Yossi,

We are trying to upgrade a project we have previously made in VB and used your COM components to WPF and we are having seriously performance issues when the screen have a lot of Gantt entries (1000+)

Performance of native WPF rendering is notoriously slow. In order to improve this situation, Steema has a new TeeChart.WPFDirect2D.dll assembly in beta which you can download from here.

Please let me know if this helps at all with your situation.

[Yossi]

Christopher ,

We have a lot of code we need to convert in order to support the new TeeChart.WPFDirect2D assembly. In addition, when using other objects such as points (non-gantt), the performance is somewhat acceptable.

Are you sure nothing can be done on your end in order to optimize this specific scenario ?

Regards,
Yossi

[Yossi]

Christopher,

In addition, I've just tested the new Direct2D on the sample I've prepared for you, and it didn't solve the issue.

When looking at the profiler, i can see the problem is at the class "Steema.TeeChart.WPFDirect2D.Styles.Gantt" and its member function: DrawValue(int valueIndex)

This function calls MultipleNextTasks over 1 Billon calls which slows the rendering function.

Can you take a look at it?

Regards,
Yossi

[Christopher]

Can you take a look at it?

What happens when you set ConnectingPen.Visible = false ?

[Yossi]

Christopher,

This seemed to have reduce the running time by half!

Thanks!
Yossi