1. A concise explanation of the problem you're experiencing.
Through the particle system I did a simulation of the effects of wind movements. Its source code is similar to the official snowing example（https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/?src=Particle%20System%20Weather.html&label=New%20in%201.45）. But with the clock, it will be affected. Particle animation becomes very fast and particles stop after the time is over. The official snowing example is also affected. Can the particle system avoid the influence of clock?
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
var start = Cesium.JulianDate.fromDate(new Date(2018, 2, 22, 16));
var stop = Cesium.JulianDate.addSeconds(start, 1500, new Cesium.JulianDate());
viewer.clock.startTime = start.clone();
viewer.clock.stopTime = stop.clone();
viewer.clock.currentTime = start.clone();
viewer.clock.clockRange = Cesium.ClockRange.CLAMPED;
viewer.clock.multiplier = 100;
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
4. The Cesium version you're using, your operating system and browser.