Thanks a lot for this info. I tried so long and so hard to find the str effect, but as you explained to me, it doesn't exist.
The effect is quite simple, I do not know why it lags, but usually only happen if I step on it, if am outside 99% of the time there is no issue. The lag is so brutal, that sometimes my screen frezze for 2 or 3 minutes, then I see everything happening at the same time. I will try your tga file, thanks again.