Innovation

I wanted to buy gepard shield but i have seen that it cause fps drop on WoE times. The first time that i saw this was on onceRO and now on a server called AragamiRO. I asked to a friend if there was a way to test it but he told me that the owner of gepard doesn't allow that, so you have to buy it in order to test it wich i don't know if it's a good option. Anyway i wanted to ask, is this true? is gepard causing FPS drop? and if it does, is there a way to fix it? Regards