#2477·DearPyGui

Memory leak and GUI appears frozen when resizing viewport

Author: krrkCreated Feb 11, 2025Updated Jun 10, 2026
Labelsstate: pendingtype: bug

Version of Dear PyGui

Version: 2.0.0 Operating System: Edition Windows 11 Enterprise Version 23H2 OS build 22631.4751 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz 3.00 GHz Integrated Graphics

My Issue/Question

Memory leak and GUI appears frozen when resizing viewport or when dragging title bar from maximized to windowed mode. The issue doesn't happen every resize or maximize/drag back to window mode but is frequent enough to cause problems. Memory also increases from 65 MB to over 1 GB when the freeze occurs in this sample application. In my real application the memory increases can make the computer run out of memory. Number of triangles also increases after the issue. This seems related to #2049. I can reproduce this with the code in #2049 and with the dearpygui demo or the code below. It also occurs without maximizing but with a resize of the viewport while in windowed mode.

To Reproduce

Steps to reproduce the behavior:

  1. Run the sample code
  2. Maximize and drag back to window mode until GUI freezes

Expected behavior

GUI should not freeze and memory consumption not increase

Screenshots/Video

https://github.com/user-attachments/assets/3e989429-838a-4aba-8f63-b8f24f1046b0

Standalone, minimal, complete and verifiable example

python
# Here's some code anyone can copy and paste to reproduce your issue
import dearpygui.dearpygui as dpg

dpg.create_context()
dpg.create_viewport(title='Custom Title', width=600, height=600)

dpg.show_about()
dpg.show_metrics()

dpg.setup_dearpygui()
dpg.show_viewport()
dpg.start_dearpygui()
dpg.destroy_context()