Thank you so much for your help
You're welcome.
If I understand your script correctly, you are setting the line delimiter to a ";"
Yes.
and replacing all multiple spaces to single spaces?
\s refers to all types of whitespace; refer to
perlre. The key here is that \s includes the newline character (\n). So, \s+ replaces multiple adjacent spaces, tabs and newlines. s///g changes all whitespace on a line.
For older netlists with ~5k cells, the script takes about 12 hours.
That is a surprisingly long time. Can you post your code for that?