Rainbow's charts were rewritten onto native rendering — and the gain was measured

Rainbow's charts were rewritten onto native rendering — and the gain was measured

On 16 October two changes were merged two seconds apart. They are not independent: the second sits on top of the first. Both are about one thing — chart speed.

What was done

• Three charts moved to native rendering. Change #7823 put the candlestick, Polymarket and the sparkline onto rendering that publishes pictures straight into a native component, bypassing the React layer. Eleven files: 419 lines added, 831 removed.

• A whole hook went under the knife. useWorkletClass solved a non-obvious problem: Reanimated worklets cannot hold an ordinary object, so the instance was created on the interface side and kept in a shared value. The component now owns the lifecycle, and the hook became unnecessary — 61 lines deleted.

• The candlestick chart was cleaned up separately. Change #7828 sits on top of the first. The heart of it is stable candle indices. Previously, loading older history shifted the chart, and that was patched with a deferred offset adjustment plus the state that tracked it. The index no longer changes when history loads, so all of that machinery disappeared along with its cause.

Measurements the author supplied himself

For a pull request this is rare: usually it says "it got faster" and stops there.

• Full redraw — 1.183 → 0.513 ms, down 57%
• A thousand candles with indicators — 1.942 → 1.286 ms, down 34%
• Memory per redraw — 111 → 33 KB, down 70%

What is unusual here

Together the two changes remove 1,311 lines and add 792 — a net cut of 519. Speed is usually paid for with more complex code; here it is the other way round, because the gain came from changing the approach to drawing rather than from tuning the old one.

For the user this means responsive charts while panning and zooming — in perps, in the token sheet and in Polymarket markets. Most noticeable on weaker phones.

Is this in the app

Not yet. The latest released version is 2.0.46 from 8 October, and the changes were merged on the 16th. Which version they appear in, Rainbow does not announce in advance.

What is changing in the wallet's code — at rnbw.wiki/pulse

$RNBW #RNBW

These entries go out in the channel @RNBWwiki.