In my experience latency isn't really too bad by itself (on the order of 1ms or less) - it's more the fact that if you have any gl commands queued, the buffer needs to be flushed before the read operation can proceed. Not a problem if that's the whole purpose of your program
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So if you have a whole optimized render pipeline and then you throw readPixels call in, it'll cause the pipeline to stall until it's all done executing and your rendering speed will suffer, but if you have a process that's optimized for just this, it's normally fine
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