UE5,If my niagara emitters count grow, it will become very slow,。
if I add a curve, or duplicate a emitter, it will compile for 4-5 seconds.
How can I speed up like Cascade 
Niagara is slightly more complex thus making it take longer to compile. The correlation between compile times and your computer parts is quite noticeable. You can either get better computer parts, or perhaps try to remove other background applications, lower engine quality, etc. to give more power for your GPU and CPU to compile.