Is there an existing issue for this?
CefSharp Version
135.0.170
Operating System
Windows 11
Architecture
x64
.Net Version
8.0
Implementation
WinForms
Reproduction Steps
Create a minimal CefSharp 120.× WPF app
Serve a basic Vue 3 SPA either:
from file://…/dist/index.html, or
via http://localhost:5173 (Vite dev server).
Interact with the UI so the page holds some transient state (e.g., text in a form).
Leave the window untouched for ≈ 5–10 minutes (exact delay varies).
Click anywhere inside the web view (that trigger a changement of url),
What i actually tried :
settings.CefCommandLineArgs.Add("force-fieldtrials",
"AutomaticTabDiscarding/Disabled");
settings.CefCommandLineArgs.Add("allow-file-access-from-files", "1");
settings.CefCommandLineArgs.Add("enable-local-file-accesses", "1");
settings.CefCommandLineArgs.Add("disable-background-timer-throttling", "1");
settings.CefCommandLineArgs.Add("disable-backgrounding-occluded-windows", "1");
settings.CefCommandLineArgs.Add("disable-renderer-backgrounding", "1");
settings.CefCommandLineArgs.Add("disable-site-isolation-trials", "1");
settings.CefCommandLineArgs.Add("disable-ipc-flooding-protection", "1");
Expected behavior
Is there another Chromium switch (or CefSharp setting) that prevents the renderer from being suspended / discarded after idle time?
Could this be a new power-saving feature in Chromium > 119 that ignores AutomaticTabDiscarding/Disabled inside CEF?
Any recommended workaround to keep a SPA alive (ping, synthetic event, etc.) until a proper fix is found?
Actual behavior
The renderer goes blank for a moment, then the full page reloads; all JS state and DOM changes are lost.
Regression?
No response
Known Workarounds
No response
Does this problem also occur in the CEF Sample Application
Yes using WPF/OffScreen command line args
Other information
No response
Is there an existing issue for this?
CefSharp Version
135.0.170
Operating System
Windows 11
Architecture
x64
.Net Version
8.0
Implementation
WinForms
Reproduction Steps
Create a minimal CefSharp 120.× WPF app
Serve a basic Vue 3 SPA either:
from file://…/dist/index.html, or
via http://localhost:5173 (Vite dev server).
Interact with the UI so the page holds some transient state (e.g., text in a form).
Leave the window untouched for ≈ 5–10 minutes (exact delay varies).
Click anywhere inside the web view (that trigger a changement of url),
What i actually tried :
settings.CefCommandLineArgs.Add("force-fieldtrials",
"AutomaticTabDiscarding/Disabled");
settings.CefCommandLineArgs.Add("allow-file-access-from-files", "1");
settings.CefCommandLineArgs.Add("enable-local-file-accesses", "1");
settings.CefCommandLineArgs.Add("disable-background-timer-throttling", "1");
settings.CefCommandLineArgs.Add("disable-backgrounding-occluded-windows", "1");
settings.CefCommandLineArgs.Add("disable-renderer-backgrounding", "1");
settings.CefCommandLineArgs.Add("disable-site-isolation-trials", "1");
settings.CefCommandLineArgs.Add("disable-ipc-flooding-protection", "1");
Expected behavior
Is there another Chromium switch (or CefSharp setting) that prevents the renderer from being suspended / discarded after idle time?
Could this be a new power-saving feature in Chromium > 119 that ignores AutomaticTabDiscarding/Disabled inside CEF?
Any recommended workaround to keep a SPA alive (ping, synthetic event, etc.) until a proper fix is found?
Actual behavior
The renderer goes blank for a moment, then the full page reloads; all JS state and DOM changes are lost.
Regression?
No response
Known Workarounds
No response
Does this problem also occur in the CEF Sample Application
Yes using WPF/OffScreen command line args
Other information
No response