The last candle glides to the new price in about a tenth of a second instead of jumping. Numbers — in the header, on the scale, in the book and the tape — are always real and instant; only drawing is animated, and the candle never goes beyond the real high and low. The switch is in ⚙, Candles.
If the chart feels slow, press “Measure smoothness” in ⚙: the chart scrolls by itself for three seconds, and you see how many frames per second your computer gets and how much of each frame our code takes. The rest is GPU and browser drawing.