web page loads very slowly at the beginning in the case of QWebEngineViews in different processes sharing the same cache path

[gaojinhsu]

For example, application A has a webengineview to load web page, so we start a process a of application A , and then
process a starts a process b of application A . Since they have the same cache path of qwebengineprofile by setting

QWebEngineProfile::defaultProfile()->setCachePath(path);
QWebEngineProfile::defaultProfile()->setPersistentStoragePath(path);

, process b shows a white and blank webengineview in a long time before web page finish loading. Is there a solution to fix this?

Qt version: 5.15.2
Platform: windows