A certificate of good conduct takes a minimum of 3 weeks to be ready for collection after you have taken your fingerprints/biometrics. The only way to make the process faster is to check if there are spaces available at the CID office and book it as the location for fingerprint-taking and collection.
Unfortunately, if you have a job and they need the original certificate of good conduct immediately, then there is nothing you can do to hasten the process. Some companies do accept application invoices as you wait for the certificate to be ready.