Hi, I was wondering if its at all possible to have particles spawn half way a long their path rather then at the start, when the level loads. I want it so its as if the emitter was already running for a few sec before the map even loads, hope that make sense.

in the main particle section give it a warmup time.

Cant you just send the time of your loading screen a tad longer so the particles will be already going?

Chicken's warmup time suggestion is the appropriate way to handle this. This is the exact reason warmup time exists on particle systems. Making the player intentionally wait longer on loading screens is a hazardous approach.