fix: fix terminal webgl context memory leak#279579
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Tyriar merged 3 commits intomicrosoft:mainfrom Jan 4, 2026
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Pull request overview
This PR fixes a WebGL context memory leak in the terminal by ensuring the WebGL renderer is properly disposed when a terminal is closed. The issue was that GPU memory was not being released even after terminal canvases were destroyed, causing memory to accumulate (167MB for 10 idle terminals).
Key Changes:
- Added explicit WebGL renderer disposal in the
XtermTerminal.dispose()method
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lszomoru
approved these changes
Jan 4, 2026
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My testing found that on my Mac, when 10 terminals were opened and left idle for a period of time, the GPU process memory increased by 167MB (319MB ->486MB). After deleting all terminals, the memory of GPU processes will not significantly decrease.
By taking a snapshot of JavaScript, it has been confirmed that the corresponding canvas has been destroyed, but the
WebGL2RenderingContexthas not been destroyed, resulting in the inability to release rendering memory.