Every client_stats push carries the totals of all inbounds, and
applyClientStatsEvent rebuilt each row it listed, so every push replaced
all rows, re-ran the client rollup (a JSON parse of every inbound's
settings) and re-rendered the whole table even when no number moved. Every
traffic push also built new online and active maps, re-running the same
rollup.
Rows are now rebuilt only when their totals or a client's numbers change,
and the previous maps are kept when a push repeats the same sets. Measured
in jsdom with 450 inbounds of 50 clients each: an unchanged client_stats
push went from 7.9ms to 0.6ms with no row rebuilt, and a repeated traffic
push from 13.5ms to 8.3ms without the rollup.
Sanaei