[deadstrobe5]

SchemaMeta.resolve_hooks looks at every attribute name in dir(cls). For each one it finds the defining class with try: parent.__dict__[attr_name] except KeyError and then checks attr.__marshmallow_hook__ with try/except AttributeError. Almost no attribute is a hook, so creating a schema class with 2 fields raises and catches about 145 exceptions. This uses attr_name in parent.__dict__ and getattr(attr, "__marshmallow_hook__", None) instead. The hooks found and their order are the same, and the existing decorator tests cover them.

Class creation is usually a one-time cost, but Schema.from_dict creates a class on every call. webargs does that for each request that uses a dict argmap (@use_args({...})).

CPU time per call, median of 11 alternating rounds in one process, CPython 3.14 on Linux.

Case	Before	After	Speedup
Schema.from_dict(argmap)().load(query), 4 fields	179 us	125 us	1.44x
Create a schema class with 2 fields	120 us	75 us	1.61x

A second run gave 1.50x and 1.71x.

I used Claude Code (Claude Opus 5.5) to profile, write this change and its test, and run the old-vs-new checks and benchmarks above.