No guzzle delay if cached

Hallo,
I use a delay in the guzzle config to avoid `429 Too Many Requests` errors.
```
    $config = [
        'handler' => $stack,
        'delay' => 700,
    ];
```
That delay is not necessary if the file cache is used.

Is it possible to use no delay if the guzzle-cache-middleware returns the cached file?

thanks
Jochen