bug: Investigate the performance difference between Cockpit as an extension and when it is running independently

### Bug description

Cockpit's performance when running from a BlueOS extension is quite different from its same version running, for example, with bun.

### Steps to reproduce

Run both Cockpit sources and measure the performance difference.
Investigate why it's not the same.

### Primary pain point(s)

_No response_

### Additional context

_No response_

### Prerequisites

- [X] I have checked to make sure that a similar request has not already been filed or fixed.

No files, tests, or entry points are named. Start by running both Cockpit sources at the same version and measuring their performance, then compare the BlueOS extension environment with the independent bun run. Done means the performance difference is reproducible and its cause is identified and documented.

Written by the indexing model from the issue text.