just try

i think it will improve 80% at least

if your pivot table show less data,it may be useful

but i suggest you should do these things:

first of all, aggregate data in cube, as far as possible

second, the workload is...

tabular is new and in memory ,but less features

you can find the difference between two,

url is here :https://msdn.microsoft.com/en-us/library/hh212940.aspx

microsoft say they will not Replace each other ,so you can...