Showing a BalloonTip on a NotifyIcon shows up after 10 seconds

[jeffrey1994]

I have a NotifyIcon on my MainForm which works fine whenever I call the showBalloonTip() method on it. The BalloonTip shows immediately.

But when I open my SecondForm and use a reference of my MainForm to access the NotifyIcon it shows the BalloonTip after 10 seconds..

reference.notifyIcon1.BalloonTipTitle = "Title";
reference.notifyIcon1.BalloonTipText = "Text";
reference.notifyIcon1.ShowBalloonTip(5000);

EDIT:
Whenever I change my FormBorderStyle to something else than "None" the delay is gone..

TL;DR
FormBorderStyle.None seems the issue..