Usually you compare on a 2D graph, with one axis being decompression speed and the other axis being compression ratio. Sometimes decompression speed is replace

Usually you compare on a 2D graph, with one axis being decompression speed and the other axis being compression ratio. Sometimes decompression speed is replaced by decompression + compression speed, for round-trip data. Very rarely you only consider compression speed, for "write-many read-seldom" data (like backups). Normally, any sensible 1D metric would be visualized as isolines in that 2D plane. But the "Weissman score" doesn't even make that much sense, it's a discontinuous, non-monotonic function with singularities right in the middle! It doesn't even make sense from a dimensional analysis perspective… the score will fluctuate wildly based on the units you choose for time and size (minutes? seconds? octets? bits?). There is no conceivable real-world application of the Weissman score. It is just a bit of bad math that appeared on TV once.