Frostmourne is a very good weapon, but people arent all on the same point with the visual effect, some do like, some doesnt.
I do like it but i have a great issue that make me put my eth frostmourne on the bank and rottin there.
With the prime pal charm ( or belials tome) theres a proc that cast multiple orange effects ( a lot of circles) to creatures, it may be crucifix or mana bomb, i dont know. Bot are good, but when that orange effect proc at the same time thant silgrasora... i drop to ...0fps. wich is ... a littl eannoying.
Maybe you can do something to the visual of the dragon to be less.... freezing ( without removing it totally).