Dynamic x and y axis scatter plot data model

Hi,

I would like to build scatter plot where user can change x and y measures from some kind of slicer. My data looks like that

My go to chart will be scatter with 2 slicers: one with list of all params (Param1-Param7) which controls x axis and second also with (Param1-Param7) which controls y axis. 

I already done this but it required pivot and crossjoin table itself what causes performance issues. Do you know any way to model data to acheive n computational complexity instead of n^2 (remove crossjoin somehow)?