[PERFORMANCE]: v11 JSON validation with large files is utterly slow

[jkowalleck]

since v11, after switching to the non-GPL JSON validators, the performance of validation of large files is utterly slow.

this is due to the slow performance of the used lib https://github.com/willynilly/rfc3987-syntax.

the following example file takes around a minute to validate: slow_validation.cdx.json
it has ~1200 entries that should conform to 'iri-reference' - which is syntax-checked by the mentioned library. see https://github.com/python-jsonschema/jsonschema/blob/6f6b3716421c07265e52a8552453b8047cf7210b/jsonschema/_format.py#L341-L350

[jkowalleck]

working on a performance boost of the underlying lib.

[jkowalleck]

see python-jsonschema/jsonschema#1392