SQL & PL/SQL :: Tuning Code Performance - UNION ALL?

I m looking for any other way that i can code without using union all for my case.my data example is like this

table1
--------
col1 col2 Segment1 Segment2 Segment3
-------------------------------------------------------------
A11 B11 John Jhonny Johnathan
A12 B12 Melisa Amy Abagial

I need to create view of above record as below:

table2
------
col1 col2 col3 col4
--------------------------------------------------------------
A11 B11 Segment1 John
A11 B11 Segment2 Jhonny
A11 B11 Segment3 Johnathan
A12 B12 Segment1 Melisa
A12 B12 Segment2 Amy
A12 B12 Segment3 Abagial

now my code is using UNION ALL to get output as in table2
select col1,col1,'Segment1' col3,Segment1 col4 from table1
union all
select col1,col1,'Segment2' col3,Segment2 from table1
union all
select col1,col1,'Segment3' col3,Segment3 from table1

But the problem is the performance is realy bad.Is there any way i can do this without using union all? The time that take to execute this is not exceptable.