How do you recude render time?

Hey yall!


I made a misty forest scene that i rendered over night and when i checked it this morning it had rendered 5% lmao. There's a lot of particles and also volume mist, wich i know takes a long time to render but it has never rendered this slow. I rendered with 256 samples so not super high. Then i tried with just 24 samples so really low and it was equally slow.

So my question is how do i speed up my renders? 


Thanks 

Joakim.