Compare page perf optimizations

[yebrahim]

The page is slow mainly because of ROC plots and confusion matrices, which are inlined and not pure. This is a flamegraph of renders when collapsing/uncollapsing sections, see how ROC curve gets re-rendered:

And this is the code profiling on clicking the buttons, all taken up by React rendering:

I think if we move the plot containers to be pure components it'll fix this.

/area front-end