UUID, UUID-OSSP extension, and ODBC issue

In using pgsqlODBC 09.03.0200 or any version prior that we have tested
we seem to be having a performance decrease to only 625 inserts per
second when using UUID as the primary key and using the UUID-OSSP to
generate the default value of uuid_generate_v1() whereas if we generate
the UUID client side for the primary key and send it with the values in
the insert transaction we can increase it to 1500 inserts per second
bypassing the UUID-OSSP extension. This is consistent and repeatable.
The only change being made is Postgres generating the UUID using the
extension or us passing the value in the insert statement. If Postgres
generates it internally while inserting using PgAdmin then it can
generate at near 2000 inserts per second so uuid-ossp shouldn't be the
problem since it can keep up, but when used over default settings in
ODBC it is 2/3 slower. The data being tested is the same in all cases. I
am using a default System DSN on Windows 8.1 Pro (no special settings).
Is this a bug or a settings adjustment that needs to be made?

Spec summary:
ODBC: pgsql 09.03.0200 with default settings;
OS: Windows 8.1 Pro;
Postgres version: 9.3.3;