annotate minified sizes relative to smallest minification

[privatenumber]

Request from @kzc:

• Each "Time" is annotated with a multiplier relative to the fastest minifier

@privatenumber It'd be useful if both the Minified size and Minzipped size columns followed a similar methodology and showed a multiplier (or percentage) relative to the smallest value in the column. The current percentages relative to the original file and gzipped file sizes are not as useful.

For example, the minzipped size for d3 shows -33% 87.23 kB for uglify-js and -31% 90.63 kB for esbuild - a two percent spread in size relative to the original gzip size. But most users are interested in the relative size difference between the bundles to show how much they could be saving over the wire - in this case: 90.63 / 87.23 = 1.039x - nearly a 4% difference between the two minifiers: (90.63/87.23 - 1) * 100 = 3.90%.

846a888#commitcomment-55713496

[KuSh]

I'm not sure it is so useful as the difference between the best and worst is generally less than 5% so multiplier would be x1.05 at max