There is no limit on the registration of specification fields, which can generate timeouts in the catalog admin.

Simulation

• Register a huge number of fields (i.e., 1000+) into a single specification.
• Open the admin of this specification, or try to change a product that contains this specification.
• Receive a 404 or 504 request's response.

Workaround

Prevent: Do not register too many values in a single specification. Fix: Deactivate the specification and register the values in several specifications, preferably distributed in different categories. Tip: Don't concatenate specifications, especially in the root category