some questions about the display rules

In order to make my design more intelligent,i create a lot of display rules in template，such as different ground elevation choose different retaining wall.
it works，but
when i set template interval=5m,

when i set template inverval=0.1m

so if i want to get an accurate model,i must set inverval a very small value,this will cause my 3D model is huge,and Calculation is very slow。

Any suggestions to solve this problem？