Processing IDE doesn't respond on launch and on saving sketch ( getting stuck - mouse clicks doesn't work)

[nagesh007]

Most appropriate sub-area of Processing 4?

Other (specify if possible)

Processing version

4.3.1

Operating system

Windows 10

Steps to reproduce this

"1. When we open processing IDE , IDE's User interface doesn't respond to user clicks for few seconds

2. Whenever I try to save the sketch, IDE's UI doesn't respond to user clicks for few seconds"

snippet

// Paste your code below :)

void setup() {

}

void draw() {

}

Additional context

This is observed only in 4.3.1 version (this bug was not there in 4.3 version)

[SableRaf]

@nagesh007 We've tried to reproduce the issue be we couldn't observe the behavior you described. Are you still encountering this issue and can you provide any more information to help us diagnose it? Thanks!

[SableRaf]

@Stefterv Actually, I was able reproduce this on Windows 10. The PDE becomes unresponsive for a rather long time upon launch and when saving a sketch. In that second case the text "Saving..." appears and hangs there until done.

Note: during this time, key inputs are buffered and appear correctly once the PDE starts responding again.

The issue doesn't seem to exist on Windows 11.

[Stefterv]

Ah cool, how about 4.3 ?

[SableRaf]

@Stefterv Actually, the issue also exists in 4.3.

[Stefterv]

https://github.com/Stefterv/processing4/actions/runs/12470958462 Can you try the gradle version :)

I just re-triggered the build so give it a sec to show

[Stefterv]

I just tested on a fresh Windows 10 VM and didn't see the same issue

[SableRaf]

We received a report of a similar sounding issue on Windows 11 on the Processing forum:

When i open processing and then open a file Processing freezes for about 1 min. This happens every time i want to open a file with Processing. It has gotten really annoying. Does anyone know a fix? I’m using processing 4.3.1, windows 11.

Source: https://discourse.processing.org/t/processing-takes-a-while-to-open-files/45530/4

[SableRaf]

@Stefterv Is it possible this is connected to the "library scanning blocking the main thread" issue you were mentioning recently?

[SableRaf]

I noticed that switching modes also causes Processing to hang in a similar way on my Windows 10 machine.

Based on the logs it does seem like mode switching triggers a scan of the libraries the first time. If a mode has been selected once, the scan doesn't seem to happen again when you switch back to it.

One exception is the p5.js mode which doesn't trigger the library scanning but still hangs the first time it is selected.

Besides, the PDE continues to hang after the library scanning has concluded.

This seems to suggest that the issue is not (only) with the library scanning.

Screenshots

[Stefterv]

Okay can you Profile Processing once with IDEA ultimate? It will give you a graph like this, showing which functions are taking the most time

[SableRaf]

Hi @nagesh007, we think #1037 may fix this. Could you try the following build and let us know if you still notice a slowdown?

https://github.com/processing/processing4/actions/runs/14471622456/artifacts/2948683453

I'm guessing you are using Android mode?