My brother used
/particle to put particles in my Minecraft server and they won't go away. I can't even get into my server because it lags so much.
Well, the problem may be in the number of particle you've set. If you had put like 100000 particle for each redstone signal plus relied this to a very fast redstone clock, your world will surely lag. I don't really know if this will work, but you can use McEdit, an editing program for Minecraft; if it's working, delete any part of the system. I hope this will help you.