I'm not sure if this is specific to the Ruvox, but I've been getting significant laggy or framey moments when using the neutral block combo of Seismic Palm with the Ruvox. My Ruvox doesn't have a catalyst and is modded with Shocking Touch, Reach, Quickening, Organ Shatter, and True Steel. I encountered this initially when fighting infested on steel path Gabii as Mirage trying to complete the first incarnon challenge.