Optimizing GLM for dual processor Westmere Xeon E5620: 200% gain (3x faster) till now

In this article I am summarizing a bunch of optimizations I performed on the colibri runtime for GLM-5.2 specifically for an Westmere Xeon E5620 dual-socket Xeon machine. It is a summary of the ideas, what worked and what did not - and it shows why some seemingly cleaver ideas were simply not worth keeping.