QWebElement evaluateJavaScript - speed issue

[maximus]

I am trying to optimize some part of my code that run slow with "evaluateJavaScript" lagging the UI a little bit.

I have tried to put all my evaluateJavaScript into one and process it directly on the QWebFrame, but it's not faster (even slower).
Is there a way to improve the speed of my calls?

I haven't moved to QWebEngine as my project is not compatible yet (using msvc2012 and need cookie management)

@ /// Name
QWebElement inputNameElement = ui->webView_workouts->page()->mainFrame()->documentElement().findFirst("input[id="name-workout"]");
QString jsValue = QString("this.value='%1';").arg("");
inputNameElement.evaluateJavaScript(jsValue);

/// Plan
QWebElement inputPlanElement = ui->webView_workouts->page()->mainFrame()->documentElement().findFirst("input[id=\"plan-workout\"]");
jsValue = QString("this.value='%1';").arg(plan);
inputPlanElement.evaluateJavaScript(jsValue);

/// Creator
QWebElement inputCreatorElement = ui->webView_workouts->page()->mainFrame()->documentElement().findFirst("input[id=\"creator-workout\"]");
jsValue = QString("this.value='%1';").arg("");
inputCreatorElement.evaluateJavaScript(jsValue);


// This is slower that above code, find out why, maybe try with QWebEngine later
//    QString jsToExecute = "$('#name-workout').val( '' ); ";
//    jsToExecute += QString("$('#plan-workout').val( '%1' ); ").arg((plan));
//    jsToExecute += "$('#creator-workout').val( '' ); ";
//    ui->webView_workouts->page()->mainFrame()->documentElement().evaluateJavaScript(jsToExecute);@

[maximus]

Still would like to know what's the best way to use evaluateJavascript()
on the page or on the QWebElement individually? Are there best practices?
Thanks