Performance Issues

## Summary
I have some months using Libcloud v2.3.0, now when I tried to update to v2.5.0 with the same application files I'm getting a lot of errors.

## Detailed Information
Using the same server and applications **with v2.5.0 scripts stop responding and freezing very often** (like 10%) and randomly (can't reproduce it), it never happens with v2.3.0. I'm just using some simple scripts for Digital Ocean and AWS to create, stop and terminate servers, and also listing some things like images, locations, sizes and keys.

Python 3.6.8
Ubuntu 18.04

Now I've downgraded again to v2.3.0 and everything is normal and stable as usual.

For more information on contributing, please see https://libcloud.readthedocs.io/en/latest/development.html

Comienza comparando los scripts de la aplicación de Python 3.6.8 en Ubuntu 18.04 con Libcloud v2.3.0 y v2.5.0 para las operaciones de AWS y DigitalOcean descritas. Captura logs o tracebacks y reduce el congelamiento intermitente a una regresión reproducible; se considera terminado cuando los scripts siguen respondiendo y estables en la versión más reciente.

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