No, you do not need another caching plugin when you have Pegasaas Accelerator WP installed.
In fact, we recommend disabling any existing optimization plugins such as those responsible for:
- Deferral of CSS / JavasScript
- Image Optimization
- Lazy Loading
Pegasaas Accelerator WP fully optimizes your WordPress website with over 20+ web performance methods and and mechanisms, all in harmony. If you choose to leave other optimization plugins installed in parallel to Pegasaas Accelerator WP, it may cause a conflict with our functionality that was designed to work together.