Ok, I tested and it IS possible to have 235008 particles on 1 screen xD But not more
Yes, normally it isn't possible to have 235008 particles on one save (Not enough space). It's only possible with pasting xD
Yes, I only use debug, but I never noticed that pasting it many times changed the particle total.
If you want to see the "many particles", just turn debug-mode (D) on and then look at the upper left side (BTW the maximum of particles in 1 save is: 235008)
No, I made a world, then copy/pasted it MANY times at the same place. If it begins to lag while pasting, DON'T STOP! Then, there are so many particles at 1 pixel, that it is working like a black hole (I call this "copy-/paste-Black-Hole-ising") That's the trick :)
Awesome! Is it compression?