Unable to import large openAPI spec

- Insomnia Version: latest
- Operating System: Mac OS X

## Details

I'm just giving your product a whirl, and I'm unable to import a large open-api spec. Specifically, I'm trying to import Stripe's Open API spec:

https://github.com/stripe/openapi/blob/master/openapi/spec3.json.

### Another example

From #5591: https://stoplight.io/api/v1/projects/shopware/admin-api/nodes/adminapi.json

The electron app hangs for a bit and a mac notification pops up with a "Insomnia is unresponsive" message.

Hoping a solution can be found.

Start by reproducing the import with Stripe's spec3.json and the Shopware admin-api.json in the Electron app, observing the reported unresponsive state. Trace the OpenAPI import entry point and identify the work that blocks the app; done means both large specifications import successfully without the app hanging.

Written by the indexing model from the issue text.