Pre-compose, time-remap/ Timewarp.
There are other particle systems that offer more control if you really need it. Expensive.
Build your main comp at a higher frame rate, render the movie, and bring it back into a 30fps comp. You can precompose and nest but the movie is generally easier to manage in your head. The highest frame rate I can use on my AE is 99fps. A more current version may offer higher frame rates.