rc-table re-runs every cell renderer whenever the Table re-renders, and
NodeList rebuilt its columns and table props on every render (the relative
time formatter was a fresh function each time). Any re-render of the Nodes
page therefore re-rendered all rows even when no node had changed: about
390ms per re-render for 150 nodes in jsdom.
The formatter is now stable and the table element is memoized on its
inputs, so a re-render that leaves the nodes untouched costs 0.5ms. A
heartbeat push that does change the nodes still re-renders every row.
Sanaei