[GTK4] Tree slower then GTK3

Describe the bug
The testcases under package org.eclipse.swt.tests.junit.performance are taking longer to execute.

Testcase : Test_org_eclipse_swt_widgets_Tree.java
this testcase takes around 700 seconds on Windows SWT where as it takes around 6000 seconds on Linux SWT / Sometimes does not respond (May be because I am using VM)

Testcase : BenchmarkSwtMultithreading.java
This testcase is also having timing differences when executed in windows and Linux.

Testcase : Test_situational.java
Not running

To Reproduce
Setup SWT workspace in Linux and run above testcases .

Expected behavior
Performance can be improved

Screenshots
If applicable, add screenshots to help explain your problem.

Environment:

1. Select the platform(s) on which the behavior is seen:

• • All OS
• • Windows
• • Linux
• • macOS

2. Additional OS info (e.g. OS version, Linux Desktop, etc)
   Ubuntu 22.04.4 LTS (VM on Windows)

** Additional context**
Identified GTK APIs (Deprecated since 4.10) causing the delay for testcase Test_org_eclipse_swt_widgets_Tree are
https://docs.gtk.org/gtk4/method.TreeModel.get_path.html
https://docs.gtk.org/gtk4/method.TreeStore.set.html

#228

[jukzi]

"longer" then what? before? windows? an apple? do you plan to contribute improvements?

[HeikoKlare]

If I am not mistaken, this is a GTK4 issue (correct me, if I am wrong @Latha-Patil). So execution times are longer than on GTK3. This issue is supposed to be a hint for the GTK4 port implementation (#228) that there might be performance problems / necessity to use different APIs. It is not related to productively used SWT on GTK.

[lathapatil]

I created the issue with different account by mistake.
@HeikoKlare ,
When run with GTK3, the test case Test_org_eclipse_swt_widgets_Tree.java takes around 5753 seconds to complete, whereas with GTK4, the test case becomes unresponsive.

I suspect that replacing the deprecated APIs related to the tree widget (Deprecated since 4.10) might help resolve the performance issue observed in this test case.

The same test case executed in Windows SWT (which uses Win32 APIs) takes significantly less time, around 700 seconds.

[lathapatil]

"longer" then what? before? windows? an apple? do you plan to contribute improvements?

Longer than Windows SWT and behavior with GTK3 and GTK4 are described here.

I would like to further check on this but not soon.

[HeikoKlare]

Thank you for the additional information! So it seems like even on GTK3 the performance is worse (than on Win32). This is probably partly due to the environment (in particular using a VM). But I would keep the issue specific to GTK4 for now, as I so not see any regression with respect to GTK3 that would require a timely fix.

[basilevs]

Tree is just slow on any GTK this is a duplicate of #882 . These tests demonstrate quadratic complexity of Tree population on Linux in standard scenarios.