ERROR:Parse SQL timeout

I am trying to import a DDL script from SQL Server to create a new physical data model. When I select the SQL script file it tries to parse it and after a long time it gives the timeout error. The file is 922K. I have removed every table I can. I have manually edited the file and removed all non-DDL statements and comments in order to make it as small as possible.

How can I get the import to succeed?