Freeing all memory of the QWebEngine (and Qt Quick)

20Percent

My app uses around 80MB of RAM, but if I add a webengine it spawns three QtWebEngineProcesses, and the app process's memory usage jumps to 200MB. Simply linking to WebEngineWidgets increases ram use by 30MB, so I made a separate .so that handles the browser side of things and returns an interface I can use to manage the QWebEngineView.

Loading my library and showing the browser works great. The window does disappear for a bit (as it switches to OpenGL rendering?).

However, I can't free the memory that the QWebEngineView consumes, along with the processes it spawns and the Qt Quick widget allocations it does. Deleting the QWebEngineView and it's page isn't enough.

If I dlclose() the library after cleanup, doing anything in the app crashes (maybe because the renderer is not switched back?).

My cleanup code is as follows:

  webEngineView->setParent(nullptr);
  webEngineView->hide();
  
  webEngineView->page()->deleteLater();
  webEngineView->setPage(nullptr);

  webEngineView->close();

  delete webEngineView;

  webEngineView = nullptr;

  //dlclose(dl_handle)
  //dl_handle = nullptr;

How can I switch back the renderer (making the window disappear and reappear)?
How can I fully kill all QtWebEngineProcesses and free the memory they use?
How can I free the other memory that is used by the QWebEngineView?

If it matters:
I am using Qt6 (6.5.0) on Arch Linux.
I have an AMD graphics card, using open source (mesa) drivers.