[Bug]: Portmaster UI (WebView2) memory leak on Windows 11

[JeetKarena]

What happened?

When Portmaster is left running idle or resumed after ~15 minutes, its UI background process (WebView2 Manager) continuously consumes excessive memory, reaching over 300 MB of RAM.

As seen in Task Manager / PC Manager:

• WebView2 Manager: ~308.2 MB
• portmaster-core: ~87.6 MB
• Portmaster: ~6.9 MB

Total memory footprint exceeds 400 MB combined during idle.

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What did you expect to happen?

Portmaster's UI process (WebView2 Manager) should maintain a low and stable memory footprint during idle states rather than accumulating memory up to 300+ MB.

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How did you reproduce it?

1. Launch Portmaster on Windows 11.
2. Leave the system idle or resume system activity after roughly 15 minutes.
3. Open Windows Task Manager / Microsoft PC Manager to inspect RAM usage for WebView2 Manager.

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Environment & System Details:

• OS: Windows 11
• Affected Component: WebView2 Manager / Portmaster UI frontend

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Debug Information:

Log files and screenshot attached below.

2026-08-01_11-15-36.zip

[github-actions]

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