I had a huge fact table with the following structure.

fact1 (Fact1ID, D1, D2,... M1, M2, M3....)
where PK is Fact1ID, D1, D2,... are dimension key and M1, M2, M3 are
measures.

Now I need add a new fact table fact2, which has many-to-one
relationship ([1-365] to 1) to fact1,

fact2(Fact1ID, Date, Dx, Dy,..., Mx, My....),
which Fact1ID and Date are PK of this fact table. (fact2 are the
daily data of fact1)

Some reporting queries need to join these two huge table and they are
very slow. Any better design?
Or just put D1, D2, ... from fact1 to fact2?