Billboard 移动不流畅

CesiumJS
1

预览地址(有点卡顿)

改变图标位置的动画 看起来很不流畅 该怎么解决呢


    const addTextBillboard = () => {

            const pos = getTargetData()

            entity = viewer.entities.add({
                position: Cesium.Cartesian3.fromDegrees(pos.lon, pos.lat),
                billboard: {
                    image: billboardImg,
                    width: 50,
                    height: 98,
                    heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
                    disableDepthTestDistance: Number.POSITIVE_INFINITY,

                }
            })
        }

        function start() {
            const nowPos = getTargetData(), prevPos = getPrevTargetData()
            const runTime = 2
            const positionTween = new TWEEN.Tween(prevPos)
                .to(nowPos, runTime * 1000)
                .easing(TWEEN.Easing.Sinusoidal.InOut)
                .onUpdate(function (config) {
                    entity.position.setValue(Cesium.Cartesian3.fromDegrees(config.lon, config.lat, config.alt))
                }).start();
        }