Ways to speedup pixel shader execution

Catching up on my Twitter DMs I came across a question about ways to increase the execution speed of pixel/fragment shaders. This is a quite broad issue and the specifics will depend on the particularities of each GPU/platform and the game content but I am expanding on my “brain-dump” style answer in this post in case others find it useful. This is not a comprehensive list, more like a list of high level pointers to get one started.

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Ways to speedup pixel shader execution