I have table with many inserts, and now DO produce script to insert like this:

INSERT INTO myTable (id,text,blablabla...) VALUES (@p1_0, @p1_1, @p1_2)
INSERT INTO myTable (id,text,blablabla...) VALUES (@p2_0, @p2_1, @p2_2)
INSERT INTO myTable (id,text,blablabla...) VALUES (@p3_0, @p3_1, @p3_2)
...

but most efficient inserts is something like:

INSERT INTO myTable
SELECT @p1_0, @p1_1, @p1_2
UNION SELECT @p2_0, @p2_1, @p2_2
UNION SELECT @p3_0, @p3_1, @p3_2
...

With 25 batch size i checked execution plan:

my insert of 25 rows take 8% and each row of first variant takes 3% (3%*25 = 75%) huge difference

measured time (with sql profiler) is about 61 ms for single insert and 400ms for 25 separate inserts.