I wish there was a faster or automated way to copyright images, its just impossible to do paperwork and pay $35 fee everytime I shoot. I usually produce 100-150 images per event and by the time they registered (which will probably take 3-4 days at least) images would be worthless.
As a matter of business, in the US you take advantage of the 3-month "after infringement" grace period by entering a mass registration online every three months. You can register literally thousands of images online under one registration form.
Once each three months, just collect all your images for those months (set up a process like a Photoshop drop or a batch file to make it simple) and register them at once. If you're really, really prolific, you can break the upload into as many increments as necessary to beat the online time-out.
You just make it a quarterly routine practice, just like handling your business taxes.