CHAR(n) CHAR SET UNICODE/LATIN define schema in 14.xx - multiply by 2 or 3 - response (6) by eejimkos

Thanks very much your answer.
To be honest i have not worked  a lot with TD loading tools  , but i am trying to understand only one thing about them.(network traffic)
If for example i have one table with two column 
clm1 char(10) latin
clm2 varchar(10) unicode.
and i want to insert to insert 1 M rows , no nulls.
 
From this example , i need at least
clm1 : 1M * 10 * 2 bytes
clm2 : 1M * 10 * 2 bytes
 
I meant before that a defined DDL must have a correspondind schema on TPT. 
My question is the following , if my real data are not 10 characters , does TPT send all the size? or it just sends the characters it founds.
Would it be better , if i know that my data are maximum 5 character for every columns , to change and on the table and on the TPT script the defined length to (5) , in order to decrease the time of sending the data or even to use less resources on the client side to create the data that must trasfer to TD.
 
Thank you.