Packaged build stutters/hiccups on first launch when Niagara particles are spawned in

Hi all! I have an issue where when I load the packaged game on a new computer, it stutters when a particle is spawned (i.e. Weapon vfx, smoke vfx). After the first hiccup, it runs flawlessly. Exiting the application and reopening it is also fine after that. No more stutters after the first time.

What’s even weirder is if I package the game again, and run a different packaged game (with new particles) on the same computer than ran the older build before. Old particles don’t stutter. But new ones stutters.

I observed this behavior in three separate computers now. Wondering if anyone knows anything I could try to prevent this from occurring? Thank you!