Moving TabbedForm with multiple tab is laggy

[n/a]

Hi,

We experienced some performance issue with the tabbedform components when there are some tab opened. When you try to move the application, by selecting the title bar, the move is very laggy. 

You can reproduce the issue with the demo project "First Look" of tabbedform. Just add 20 tabs and try to move the application, you will experienced some lags.

Do you have a workaround to avoid this behavior ?

Thanks a lot

 

[Dess | Tech Support Engineer, Principal]

Hello, Eric,

Following the provided information, I have added 20 tabs in the Demo application >> Tabbed Form >> First Look example. It seems that moving the form seems to work as expected on my end. Please refer to the attached gif file illustrating the behavior on my end with the latest version.

Could you please confirm that you are using the latest version /R2 2021 SP1/ of the Telerik UI for WinForms suite? What is the Windows version of the problematic machine? 

I am looking forward to your reply.

 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik

[n/a]

Hi,

Thanks for your answer. As I can see it works well.

Telerik version sample we used is R2 2021 SP1. (2021.2.615) donwloaded from windows store.

I attached a gif of what I experiment. It is not as evident in video, but if you look when I release the mouse boutton you can see that the window is still moving. To be more precise about the behavior, there is a lag between the move of the mouse en the move of the window.

We tested on diffrent PC (all in Windows 10 Pro 2004) with same results. But in RDP and remote app it works well. 

 

Thanks for you help

Best regards

[Dess | Tech Support Engineer, Principal]

Hello, Eric,
 
The attached gif file is greatly appreciated. Even though it is hard to see the illustrated behavior in the gif file since it is quite small in size and blurry, I haven't noticed any delay when moving the tabbed form. There is only a slight delay when you release the mouse and the form is still moving. 

I would like to note that we haven't had similar reports from other customers.

Since you mentioned that this undesired behavior is not observed in RDP and remote app, I suspect that it might be related to the specific environment and the Windows version in particular or the video drivers. After some research in general programming forums, I have found the following thread which is related to this topic:
https://answers.microsoft.com/en-us/windows/forum/all/window-dragging-is-really-laggy/37a5f9aa-7603-4abe-93b3-894756f2c3bd 

Please give the suggested approaches a try and see how it works on your local machine.

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik