[STATUS FX] I'm not able to run it

I've followed the example in the script description, but when I set the green marker on on a token the effect doesn't occur. I've tried even with: Bubbling-Acid Bubbling Acid bubbling acid

You need to have the player tab on the page where you are running the effect. This drove me crazy too. :)

Lol that was the problem :D thanks

This script is very cool, but I'm not sure about how to use it. I mean, I could give my light sources a dynamic effect to simulate a burning torch, and enhance realism. Or I can use it to represent some statuses, like poisoned with the bubbling acid effect on a token. I've noticed two issues about this. If I'm right the effects are not blocked by walls, so if I toggle a status effect on a torch to make it looks burning then I have to manually remove the effect when players are no longer in the torch sight (when they turn a corner). Second issue is about performance. If I forget to toggle off an effect when I open again the page on which the effect is still active the page loading is terribly slow. I end with a little question: how many effects can I activate without provoking lag?

I don't know. I eventually disabled the script due to lag problems. I don't know if it was just a conflict with something on my system, or a real lag problem, but the benefits weren't enough to justify the time to troubleshoot.

Unfortunately, there's nothing that can be done in the API about the performance issues with FX. The VTT really needs to be better about culling off-screen particles and particles that should be hidden by fog of war/dynamic lighting. There is also a performance issue where if you switch to a new tab/window and return to the VTT, it'll try to spawn all the particles at once that would have been in the VTT while it was in the background. Really what the VTT should do here is skip spawning FX if its window doesn't have focus. 

Yeah, I used it in exactly one actual game, and the response time almost killed the encounter. It's a great idea though. It would be nice if Roll20 supported animated gifs, at least. Torches would be simpler...