Engine Performance Bug Found

Today we tracked down a bug that causes local shader compilation to stall other engine tasks such as texture streaming. This means that if you were playing content that used shaders that were not present in your local cache, then the loading of necessary assets would be stalled (causing the low-quality stand-in textures to be used for way longer than intended). This doesn't resolve all graphical/performance issues that we are investigating, but it should help. We have deployed this change and it'll automatically download next time you run Path of Exile. We are continuing our investigation into other weird behaviour and will keep you updated. Thanks for your feedback and patience!