JQuery confirmation dialog produces Chrome console '[Violation] Handler took Xms' warning

Question

I have a click handler that requires confirmation before proceeding:

$('.entry').on('click', function(e){
    e.preventDefault();

    let confirmation = confirm("Are you sure you want to delete this entry?");
    if (confirmation) {
        //do Ajax 
    }
    return false;
});

Adding the confirmation produces a Chrome violation error in the console. The ms shown is the time it takes the user to click ok/cancel.

Is there a way of preventing this message showing in the console? Moving the Ajax call into its own function doesn't make a difference.