Screen freezing when starting Game

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IronMan
Lava Lord
90 | 9
I'm experiencing a small technical Problem everytime I start an instance of D2. Around 2-5 seconds after clicking "play" on launcher my screen freezes for 5-15 seconds before everything continues as normal.
When it freezes, the screen shows a snapshot of something that was on screen some time ago, like my browser window or an open folder.

Wondering if anyone knows what that could be / had something similar?
Thanks in advance