in src/helper/timeline.ts [172:182]
const mockNow = function () {
// // Use same time in one frame.
// var realFrameTime = NativeDate.now();
// // Split frame. Add 8ms offset on the second half
// // Avoid infinite loop when some logic determine whether to break the loop based on the execution time.
// // For example https://github.com/apache/echarts/blob/737e23c0054e6b501ecc6f562920cffae953b5c6/src/core/echarts.ts#L537
// var frameDeltaTime = realFrameTime - realFrameStartTime;
var frameDeltaTime = 0;
// Use same time in one frame.
return TIMELINE_START + (timelineTime + frameDeltaTime) * window.__VRT_PLAYBACK_SPEED__;
};