073eee46_n_Memory_Columnar_Store__IMCS___Recommendations
[Parameter name] imcs.page_size [Description] Size of B-Tree page size in bytes [Default value] 4096 [Recommendations] 
As far as B-Tree is stored in memory, it is not so critical to use large pages. But small page may increase per-element storage overhead.
In-Memory Columnar Store (IMCS)
Recommendations