Tiled Landscape/Layer info, Problem

Hey im using Tiled Landscape, my Landscape Material is Black, SO i Need to Fill it, And when im just " SELECT 1 Landscape" and Create and Fill the Layer, Ue4 runs Insane High Memory, my Memory Use was 98% ,(Than i Killed the Process) otherwise my PC Freezes, any Ideas? i have 32 Gb Ram, so there shouldn’T be a Problem

2017x2017 , and 4x4 Tiles.

Hope someone can help me, Thanks!

Its just 4x4 KM, IT cant be, that its Just eat so much RAM when i Only fill an Layer?