Hey @GRWalton
This could be related to how unreal move things in the world.
Like @ZulCul mention it will improve the performance if you set cull distance or something to disable the render.
Each tick an object move the engine try to recalculate the bound of the render. Even if the particle is disabled.
The options are:
A - Set distance culling or disable the rendering if the particle is disabled.
B - Add the component when you want to be enabled