Subagent - Very poor performance

### What happened?

The subagents are taking a very very long time to complete.

Each run (of a single thread of a single subagent) seem to be taking additively more time.

The first subagent ran in 5 mins, the second took about 12 mins, the third in sequence took over 15 mins.
In fact it seems to be taking time with the status "starting...". So it is not even running for that long.

Why does a subagent take time to start?
Is this a quota issue?
I have a Google AI Pro plan.

### What did you expect to happen?

I expect the subagents to start immediately and process the prompt.

### Client information

Client Information

Run `gemini` to enter the interactive CLI, then run the `/about` command.

```console
> /about
│ CLI Version 0.37.1 │
│ Git Commit 3b2d4f100 │
│ Model gemini-3-flash-preview │
│ Sandbox no sandbox │
│ OS linux │
│ Auth Method Signed in with Google (ksprashanth82@gmail.com) │
│ Tier Gemini Code Assist │
│ GCP Project cloudshell-gca │
│ IDE Client Cloud Shell
```

### Login information

gmail auth

### Anything else we need to know?

_No response_