It appears to be related to loading the shaders. Using an SSD might help, but it seems the most reliable way to mitigate this is to cap to 30 FPS. https://steamcommunity.com/app/204120/discussions/0/343788552535936106/
Talk:Lego Harry Potter: Years 5-7
When your PC port is so shitty, that it can't load shaders properly xD.
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