combine multiple files by column into one files already sorted!

I have multiple files; each file contains a certain data in a column view
simply i want to combine all those files into one file in columns

example

file1:

a
b
c
d

file 2:

1
2
3
4

file 3:

G
H
J
K

The output file should be like this
out_file:

a   1  G
b   2  H
c   3  J
d   4  K

anyone can support me please? kindly note that I want to use the fastest shell program as my files include many many # of records (the above is just an example actually I'm talking about ~ 1000 record per file)

also there is no any kind of matching test required as the files are containing the same number of records and already sorted

paste -d" " file1 file2 file3 > out_file

Thanks a million "bartus11", although i spend much time searching for a solution but I've learned one important lesson; ask Experts is the easiest way

Even though asking an expert is the easiest way to find an answer,
by far it is not the easiest way to learn.

If you really want to learn, you should first do extensive research,
exhaust all your possibilities, then ask an expert.

At the end you should ask yourself why you did not find a similar,
the same or a better solution.

Then help me plz, from where shall I start?