Particle systems are an ideal candidate for multi-threading in games. Most games have particle systems and their general nature of independent entities lends well to parallelism.
Writing the sample code for this post I was amazed myself to see how simple it was to reach over 20 times performance improvement with so little effort.
Intel® Black Belt Software Developers, Intel® Software Innovators, & Intel® Student Ambassadors: March 2018
Intel® Developers and Innovators were bus